diff --git a/NEWS b/NEWS
index c96895cfc..dfcf2193c 100644
--- a/NEWS
+++ b/NEWS
@@ -36,6 +36,12 @@ New in spot 2.8.7.dev (not yet released)
   - ltlsynt --algo=lar uses the new version of to_parity() mentionned
     below.  The old version is available via --algo=lar.old
 
+  - The dot printer is now automatically using rectangles with rounded
+    corners for automata states if one state label have five or more
+    characters.  This saves space with very long labels.  Use --dot=c,
+    --dot=e, or --dot=E to force the use of Circles, Ellipses, or
+    rEctangles.
+
   Library:
 
   - Historically, Spot only supports LTL with infinite semantics
@@ -110,6 +116,13 @@ New in spot 2.8.7.dev (not yet released)
     dealing with n-ary operators and isolating subsets of operands
     that can be relabeled as a single term.
 
+  - print_dot() default was changed to use circles for automata with
+    fewer than 10 unamed states, ellipses for automata with up to 1000
+    unamed states (or named states with up to 4 characters), and
+    rounded rectangles otherwise.  Rectangles are also used for
+    automata with acceptance bullets on states.  The new "E" option
+    can be used to force rectangles in all situations.
+
   Backward-incompatible changes:
 
   - iar() and iar_maybe() have been moved from
diff --git a/bin/common_aoutput.cc b/bin/common_aoutput.cc
index 8b02c0477..f19326889 100644
--- a/bin/common_aoutput.cc
+++ b/bin/common_aoutput.cc
@@ -1,5 +1,5 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2012-2019 Laboratoire de Recherche et Développement
+// Copyright (C) 2012-2020 Laboratoire de Recherche et Développement
 // de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
@@ -97,7 +97,7 @@ static const argp_option options[] =
     /**************************************************/
     { nullptr, 0, nullptr, 0, "Output format:", 3 },
     { "dot", 'd',
-      "1|a|A|b|B|c|C(COLOR)|e|f(FONT)|h|k|K|n|N|o|r|R|s|t|u|v|y|+INT|<INT|#",
+      "1|a|A|b|B|c|C(COLOR)|e|E|f(FONT)|h|k|K|n|N|o|r|R|s|t|u|v|y|+INT|<INT|#",
       OPTION_ARG_OPTIONAL,
       "GraphViz's format.  Add letters for "
       "(1) force numbered states, "
@@ -109,6 +109,7 @@ static const argp_option options[] =
       "(C) color nodes with COLOR, "
       "(d) show origins when known, "
       "(e) force elliptic nodes, "
+      "(E) force rEctangular nodes, "
       "(f(FONT)) use FONT, "
       "(g) hide edge labels, "
       "(h) horizontal layout, "
diff --git a/spot/twaalgos/dot.cc b/spot/twaalgos/dot.cc
index 392abb58b..57e30416d 100644
--- a/spot/twaalgos/dot.cc
+++ b/spot/twaalgos/dot.cc
@@ -86,7 +86,9 @@ namespace spot
       acc_cond::mark_t inf_sets_ = {};
       acc_cond::mark_t fin_sets_ = {};
       unsigned opt_shift_sets_ = 0;
-      enum { ShapeAuto = 0, ShapeCircle, ShapeEllipse } opt_shape_ = ShapeAuto;
+      enum { ShapeAuto = 0, ShapeCircle, ShapeEllipse,
+             ShapeRectangle } opt_shape_ = ShapeAuto;
+      const char* extrastyle = "";
       bool opt_force_acc_trans_ = false;
       bool opt_vertical_ = false;
       bool opt_name_ = false;
@@ -254,6 +256,9 @@ namespace spot
             case 'e':
               opt_shape_ = ShapeEllipse;
               break;
+            case 'E':
+              opt_shape_ = ShapeRectangle;
+              break;
             case 'f':
               if (*options != '(')
                 throw std::runtime_error
@@ -495,7 +500,8 @@ namespace spot
           return;
         std::string dest = string_dst(dst, color_num);
         if (univ == 0)
-          os_ << "  " << dest << " [label=<>,shape=point]\n";
+          os_ << "  " << dest
+              << " [label=<>,shape=point,width=0.05,height=0.05]\n";
         if (print_edges)
           {
             for (unsigned d: aut_->univ_dests(dst))
@@ -603,14 +609,18 @@ namespace spot
             os_ << "  node [shape=\"circle\"]\n";
             break;
           case ShapeEllipse:
-            // Do not print anything.  Ellipse is
-            // the default shape used by GraphViz.
+            // Ellipse is the default shape used by GraphViz, but
+            // with set width and height so it's a circle when possible.
+            os_ << "  node [shape=\"ellipse\",width=\"0.5\",height=\"0.5\"]\n";
+            break;
+          case ShapeRectangle:
+            os_ << "  node [shape=\"box\",style=\"rounded\",width=\"0.5\"]\n";
             break;
           case ShapeAuto:
             SPOT_UNREACHABLE();
           }
         if (!opt_node_color_.empty())
-          os_ << "  node [style=\"filled\", fillcolor=\""
+          os_ << "  node [style=\"filled" << extrastyle << "\", fillcolor=\""
               << opt_node_color_ << "\"]\n";
         if (!opt_font_.empty())
           os_ << "  fontname=\"" << opt_font_
@@ -713,7 +723,7 @@ namespace spot
             auto iter = highlight_states_->find(s);
             if (iter != highlight_states_->end())
               {
-                os_ << ", style=\"bold";
+                os_ << ", style=\"bold" << extrastyle;
                 if (!opt_node_color_.empty())
                   os_ << ",filled";
                 os_ << "\", color=\"" << palette[iter->second % palette_mod]
@@ -884,7 +894,8 @@ namespace spot
         if (opt_name_)
           name_ = graph_name_;
         mark_states_ = (!opt_force_acc_trans_
-                        && aut_->prop_state_acc().is_true());
+                        && aut_->prop_state_acc().is_true()
+                        && aut_->num_sets() > 0);
         dcircles_ = (mark_states_
                      && (!opt_bullet || opt_bullet_but_buchi)
                      && (aut_->acc().is_buchi() || aut_->acc().is_co_buchi()));
@@ -892,22 +903,37 @@ namespace spot
           {
             if ((inline_state_names_ && (sn_ || sprod_ || opt_state_labels_))
                 || (opt_state_labels_ && opt_latex_)
-                || aut->num_states() > 100
+                || aut->num_states() > 1000
+                || (mark_states_ && !dcircles_)
                 || orig_)
+              {
+                opt_shape_ = ShapeRectangle;
+                // If all state names are very short, prefer ellipses.
+                if (!opt_state_labels_ && !orig_
+                    && !(mark_states_ && !dcircles_)
+                    && ((sn_ && std::all_of(sn_->begin(), sn_->end(),
+                                            [](const std::string& s)
+                                            { return s.size() <= 4; }))
+                        || (sprod_ && std::all_of(sprod_->begin(),
+                                                  sprod_->end(),
+                                                  [](auto p)
+                                                  {
+                                                    return (p.first < 100
+                                                            && p.second < 100);
+                                                  }))))
+                  opt_shape_ = ShapeEllipse;
+              }
+            else if (aut->num_states() > 10)
               {
                 opt_shape_ = ShapeEllipse;
-                // If all state names are short, prefer circles.
-                if (!opt_state_labels_ && !orig_ &&
-                    sn_ && std::all_of(sn_->begin(), sn_->end(),
-                                       [](const std::string& s)
-                                       { return s.size() <= 2; }))
-                  opt_shape_ = ShapeCircle;
               }
             else
               {
                 opt_shape_ = ShapeCircle;
               }
           }
+        if (opt_shape_ == ShapeRectangle)
+          extrastyle = ",rounded";
         auto si =
           std::unique_ptr<scc_info>(opt_scc_ ? new scc_info(aut) : nullptr);
 
diff --git a/tests/core/alternating.test b/tests/core/alternating.test
index c4dd98298..8970848bb 100755
--- a/tests/core/alternating.test
+++ b/tests/core/alternating.test
@@ -1,7 +1,7 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2016-2018 Laboratoire de Recherche et Développement
-# de l'Epita (LRDE).
+# Copyright (C) 2016-2018, 2020 Laboratoire de Recherche et
+# Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -62,6 +62,7 @@ digraph "" {
   rankdir=LR
   label="Fin(⓿)\n[co-Büchi]"
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> -11 [arrowhead=onormal]
   subgraph cluster_0 {
@@ -88,7 +89,7 @@ digraph "" {
   color=green
   label=""
   3 [label="GF(b)"]
-  -8 [label=<>,shape=point]
+  -8 [label=<>,shape=point,width=0.05,height=0.05]
   }
   subgraph cluster_5 {
   color=red
@@ -100,15 +101,15 @@ digraph "" {
   label=""
   0 [label="((((a) U (b)) && GF(b)) && FG(a))"]
   }
-  -11 [label=<>,shape=point]
+  -11 [label=<>,shape=point,width=0.05,height=0.05]
   -11 -> 0
   -11 -> 2
   0 -> -1 [label="b", arrowhead=onormal]
-  -1 [label=<>,shape=point]
+  -1 [label=<>,shape=point,width=0.05,height=0.05]
   -1 -> 1
   -1 -> 3
   0 -> -4 [label="a & !b", style=bold, color="#E31A1C", arrowhead=onormal]
-  -4 [label=<>,shape=point]
+  -4 [label=<>,shape=point,width=0.05,height=0.05]
   -4 -> 1 [style=bold, color="#E31A1C"]
   -4 -> 3 [style=bold, color="#E31A1C"]
   -4 -> 5 [style=bold, color="#E31A1C"]
@@ -506,23 +507,23 @@ digraph "" {
   rankdir=LR
   label=<Fin(<font color="#1F78B4">⓿</font>)<br/>[co-Büchi]>
   labelloc="t"
-  node [shape="circle"]
+  node [shape="box",style="rounded",width="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
   I [label="", style=invis, width=0]
   I -> -1 [arrowhead=onormal]
-  -1 [label=<>,shape=point]
+  -1 [label=<>,shape=point,width=0.05,height=0.05]
   -1 -> 0
   -1 -> 1
   0 [label=<0>]
   0 -> 0 [label=<!a &amp; !c>]
   0 -> -1.1 [label=<a &amp; b &amp; !c>, style=bold, color="#FF4DA0", $style]
-  -1.1 [label=<>,shape=point]
+  -1.1 [label=<>,shape=point,width=0.05,height=0.05]
   -1.1 -> 0 [style=bold, color="#FF4DA0"]
   -1.1 -> 1 [style=bold, color="#FF4DA0"]
   0 -> -1.2 [label=<a &amp; !c>, style=bold, color="#FF7F00", arrowhead=onormal]
-  -1.2 [label=<>,shape=point]
+  -1.2 [label=<>,shape=point,width=0.05,height=0.05]
   -1.2 -> 0 [style=bold, color="#FF7F00"]
   -1.2 -> 1 [style=bold, color="#FF7F00"]
   1 [label=<1>]
@@ -569,6 +570,7 @@ digraph "SLAA for c R (c | G(a & b) | (F!b & F!a))" {
   rankdir=LR
   label=<Fin($color1) &amp; Fin($color)<br/>[Streett-like 2]>
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
@@ -598,10 +600,10 @@ digraph "SLAA for c R (c | G(a & b) | (F!b & F!a))" {
   color=green
   label=""
   0 [label=<c R (c | G(a &amp; b) | (F!b &amp; F!a))>]
-  -1 [label=<>,shape=point]
-  -4 [label=<>,shape=point]
-  -7 [label=<>,shape=point]
-  -10 [label=<>,shape=point]
+  -1 [label=<>,shape=point,width=0.05,height=0.05]
+  -4 [label=<>,shape=point,width=0.05,height=0.05]
+  -7 [label=<>,shape=point,width=0.05,height=0.05]
+  -10 [label=<>,shape=point,width=0.05,height=0.05]
   }
   0 -> 4 [label=<c>]
   0 -> 0 [label=<!a &amp; !b &amp; !c>]
@@ -665,6 +667,7 @@ digraph "SLAA for c R (c | G(a & b) | (F!b & F!a))" {
   rankdir=LR
   label=<Fin($color1) &amp; Fin($color)<br/>[Streett-like 2]>
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
@@ -689,11 +692,11 @@ digraph "SLAA for c R (c | G(a & b) | (F!b & F!a))" {
   color=green
   label=""
   0 [label=<c R (c | G(a &amp; b) | (F!b &amp; F!a))>]
-  -1 [label=<>,shape=point]
-  -4 [label=<>,shape=point]
-  -7 [label=<>,shape=point]
+  -1 [label=<>,shape=point,width=0.05,height=0.05]
+  -4 [label=<>,shape=point,width=0.05,height=0.05]
+  -7 [label=<>,shape=point,width=0.05,height=0.05]
   1 [label=<G(a &amp; b)>]
-  -10 [label=<>,shape=point]
+  -10 [label=<>,shape=point,width=0.05,height=0.05]
   }
   0 -> 4 [label=<c>]
   0 -> 0 [label=<!a &amp; !b &amp; !c>]
@@ -745,7 +748,7 @@ digraph "" {
   rankdir=LR
   label=<Fin(<font color="#1F78B4">⓿</font>)<br/>[co-Büchi]>
   labelloc="t"
-  node [shape="circle"]
+  node [shape="box",style="rounded",width="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
@@ -753,14 +756,14 @@ digraph "" {
   I -> 0
   0 [label=<0>]
   0 -> -1.1 [label=<b &amp; c>, style=bold, color="#FF4DA0", arrowhead=onormal]
-  -1.1 [label=<>,shape=point]
+  -1.1 [label=<>,shape=point,width=0.05,height=0.05]
   -1.1 -> 1 [style=bold, color="#FF4DA0"]
   -1.1 -> 2 [style=bold, color="#FF4DA0"]
   1 [label=<1>]
   1 -> -1.1 [label=<a &amp; b>, style=bold, color="#FF4DA0", arrowhead=onormal]
   2 [label=<2>]
   2 -> -1.2 [label=<!a &amp; !b &amp; !c>, style=bold, color="#FF7F00", $style]
-  -1.2 [label=<>,shape=point]
+  -1.2 [label=<>,shape=point,width=0.05,height=0.05]
   -1.2 -> 1 [style=bold, color="#FF7F00"]
   -1.2 -> 2 [style=bold, color="#FF7F00"]
 }
@@ -792,7 +795,7 @@ digraph "" {
   rankdir=LR
   label=<Fin(<font color="#1F78B4">⓿</font>)<br/>[co-Büchi]>
   labelloc="t"
-  node [shape="circle"]
+  node [shape="box",style="rounded",width="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
@@ -800,17 +803,17 @@ digraph "" {
   I -> 0
   0 [label=<0>]
   0 -> -1.1 [label=<b &amp; c>, style=bold, color="#FF4DA0", arrowhead=onormal]
-  -1.1 [label=<>,shape=point]
+  -1.1 [label=<>,shape=point,width=0.05,height=0.05]
   -1.1 -> 1 [style=bold, color="#FF4DA0"]
   -1.1 -> 2 [style=bold, color="#FF4DA0"]
   1 [label=<1>]
   1 -> -1.3 [label=<a &amp; b>, style=bold, color="#6A3D9A", arrowhead=onormal]
-  -1.3 [label=<>,shape=point]
+  -1.3 [label=<>,shape=point,width=0.05,height=0.05]
   -1.3 -> 1 [style=bold, color="#6A3D9A"]
   -1.3 -> 2 [style=bold, color="#6A3D9A"]
   2 [label=<2>]
   2 -> -1.2 [label=<!a &amp; !b &amp; !c>, style=bold, color="#FF7F00", $style]
-  -1.2 [label=<>,shape=point]
+  -1.2 [label=<>,shape=point,width=0.05,height=0.05]
   -1.2 -> 1 [style=bold, color="#FF7F00"]
   -1.2 -> 2 [style=bold, color="#FF7F00"]
 }
@@ -848,6 +851,7 @@ digraph "SLAA for G((b & Fa) | (!b & G!a))" {
   rankdir=LR
   label=<Fin(<font color="#1F78B4">⓿</font>)<br/>[co-Büchi]>
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
@@ -872,8 +876,8 @@ digraph "SLAA for G((b & Fa) | (!b & G!a))" {
   color=green
   label=""
   0 [label=<G((b &amp; Fa) | (!b &amp; G!a))>]
-  -1 [label=<>,shape=point]
-  -4 [label=<>,shape=point]
+  -1 [label=<>,shape=point,width=0.05,height=0.05]
+  -4 [label=<>,shape=point,width=0.05,height=0.05]
   }
   0 -> 0 [label=<a &amp; b>]
   0 -> -1 [label=<!a &amp; b>, arrowhead=onormal]
diff --git a/tests/core/dstar.test b/tests/core/dstar.test
index 20a72545c..f8e033cbc 100755
--- a/tests/core/dstar.test
+++ b/tests/core/dstar.test
@@ -1,6 +1,6 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2013-2016, 2018 Laboratoire de Recherche et
+# Copyright (C) 2013-2016, 2018, 2020 Laboratoire de Recherche et
 # Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -63,7 +63,7 @@ digraph "" {
   rankdir=LR
   label="Fin(0) & Inf(1)\n[Rabin 1]"
   labelloc="t"
-  node [shape="circle"]
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 0
   0 [label="0"]
diff --git a/tests/core/readsave.test b/tests/core/readsave.test
index 9e85b86b3..010398468 100755
--- a/tests/core/readsave.test
+++ b/tests/core/readsave.test
@@ -420,6 +420,7 @@ digraph "G(Fa & Fb)" {
   rankdir=LR
   label=<Inf($zero)&amp;Inf($one)<br/>[gen. Büchi 2]>
   labelloc="t"
+  node [shape="ellipse",width="0.5",height="0.5"]
   fontname="Lato"
   node [fontname="Lato"]
   edge [fontname="Lato"]
@@ -491,6 +492,7 @@ digraph "" {
   rankdir=LR
   label="(Fin(⓿)|Fin(❸)) | (Fin(❶) & Inf(❷))\n[gen. Rabin 3]"
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 0
   0 [label="0"]
@@ -545,7 +547,7 @@ digraph "" {
   rankdir=LR
   label="(Fin(⓿)|Fin(❸)) | (Fin(❶) & Inf(❷))\n[gen. Rabin 3]"
   labelloc="t"
-  node [shape="circle"]
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   0 [label="0"]
   1 [label="1\n⓿❸", tooltip="test me"]
@@ -568,7 +570,7 @@ diff out expected2
 cat >expected3 <<EOF
 digraph "" {
   rankdir=LR
-  node [shape="circle"]
+  node [shape="ellipse",width="0.5",height="0.5"]
   I [label="", style=invis, width=0]
   0 [label="6", peripheries=2]
   u0 [label="...", shape=none, width=0, height=0, tooltip="hidden successors"]
@@ -891,6 +893,7 @@ run 0 autfilt -dAk input6 >output6d
 cat >expect6d <<EOF
 digraph "" {
   rankdir=LR
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 1
   0 [label="0\nb"]
@@ -914,6 +917,7 @@ digraph "" {
   rankdir=LR
   label=<Inf(<font color="#1F78B4">⓿</font>)<br/>[Büchi]>
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 1
   0 [label=<0<br/>b>]
@@ -1031,14 +1035,15 @@ autfilt -dA input9 > output9
 cat >expected9 <<EOF
 digraph "a U (b U c)" {
   rankdir=LR
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 2
-  0 [label="0", peripheries=2, style="bold", color="#1F78B4"]
+  0 [label="0", peripheries=2, style="bold,rounded", color="#1F78B4"]
   0 -> 0 [label="1", style=bold, color="#1F78B4"]
   1 [label="1"]
   1 -> 0 [label="c", style=bold, color="#FF4DA0"]
   1 -> 1 [label="b & !c", style=bold, color="#FF7F00"]
-  2 [label="new\nline", style="bold", color="#6A3D9A"]
+  2 [label="new\nline", style="bold,rounded", color="#6A3D9A"]
   2 -> 0 [label="c", style=bold, color="#6A3D9A"]
   2 -> 1 [label="!a & b & !c"]
   2 -> 2 [label="a & !c"]
@@ -1046,12 +1051,13 @@ digraph "a U (b U c)" {
 EOF
 diff output9 expected9
 autfilt -dbar input9 > output9a
-style=', style="bold", color="#1F78B4"'
+style=', style="bold,rounded", color="#1F78B4"'
 cat >expected9a <<EOF
 digraph "a U (b U c)" {
   rankdir=LR
   label=<Inf(<font color="#1F78B4">⓿</font>)<br/>[Büchi]>
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 2
   0 [label=<0<br/><font color="#1F78B4">⓿</font>>$style]
@@ -1059,7 +1065,7 @@ digraph "a U (b U c)" {
   1 [label=<1>]
   1 -> 0 [label=<c>, style=bold, color="#FF4DA0"]
   1 -> 1 [label=<b &amp; !c>, style=bold, color="#FF7F00"]
-  2 [label=<new<br/>line>, style="bold", color="#6A3D9A"]
+  2 [label=<new<br/>line>, style="bold,rounded", color="#6A3D9A"]
   2 -> 0 [label=<c>, style=bold, color="#6A3D9A"]
   2 -> 1 [label=<!a &amp; b &amp; !c>]
   2 -> 2 [label=<a &amp; !c>]
@@ -1097,6 +1103,7 @@ ltl2tgba 'a U b' | autfilt --remove-ap=b=0 --name=%M --dot=dA >out
 cat >expected <<EOF
 digraph "a U b" {
   rankdir=LR
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 0
   0 [label="0 (1)"]
diff --git a/tests/core/sccdot.test b/tests/core/sccdot.test
index 69c75e8d6..96e75dbe6 100755
--- a/tests/core/sccdot.test
+++ b/tests/core/sccdot.test
@@ -76,7 +76,7 @@ digraph "" {
   rankdir=LR
   label="(Inf(0)&Inf(1)) & Fin(2)\n[Streett-like 3]"
   labelloc="t"
-  node [shape="circle"]
+  node [shape="ellipse",width="0.5",height="0.5"]
   I [label="", style=invis, width=0]
   I -> 1
   subgraph cluster_0 {
diff --git a/tests/core/tgbagraph.test b/tests/core/tgbagraph.test
index 5629c95db..17b8bf00c 100755
--- a/tests/core/tgbagraph.test
+++ b/tests/core/tgbagraph.test
@@ -1,7 +1,7 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2014-2018 Laboratoire de Recherche et Développement de
-# l'Epita (LRDE).
+# Copyright (C) 2014-2018, 2020 Laboratoire de Recherche et
+# Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -122,6 +122,7 @@ digraph "" {
   rankdir=LR
   label="t\n[Fin-less 2]"
   labelloc="t"
+  node [shape="ellipse",width="0.5",height="0.5"]
   I [label="", style=invis, width=0]
   I -> 0
   0 [label="0"]
@@ -237,7 +238,7 @@ digraph "" {
   rankdir=LR
   label="t\n[all]"
   labelloc="t"
-  node [shape="circle"]
+  node [shape="ellipse",width="0.5",height="0.5"]
   I [label="", style=invis, width=0]
   I -> 2
   0 [label="s1", style="bold", color="#E31A1C"]
@@ -251,7 +252,7 @@ digraph "" {
   rankdir=LR
   label="t\n[all]"
   labelloc="t"
-  node [shape="circle"]
+  node [shape="ellipse",width="0.5",height="0.5"]
   I [label="", style=invis, width=0]
   I -> 0
   0 [label="s3", style="bold", color="#505050"]
diff --git a/tests/python/_product_weak.ipynb b/tests/python/_product_weak.ipynb
index 7c31ec51a..093d5d022 100644
--- a/tests/python/_product_weak.ipynb
+++ b/tests/python/_product_weak.ipynb
@@ -142,54 +142,54 @@
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       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fa5b04de690> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7dbc0e99f0> >"
       ]
      },
      "metadata": {},
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diff --git a/tests/python/atva16-fig2b.ipynb b/tests/python/atva16-fig2b.ipynb
index 900bfd3aa..72a83dc99 100644
--- a/tests/python/atva16-fig2b.ipynb
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@@ -348,7 +372,7 @@
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diff --git a/tests/python/automata.ipynb b/tests/python/automata.ipynb
index 09ecfe0be..80d028aa3 100644
--- a/tests/python/automata.ipynb
+++ b/tests/python/automata.ipynb
@@ -178,7 +178,7 @@
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diff --git a/tests/python/decompose.ipynb b/tests/python/decompose.ipynb
index 1341bf615..15c98ec7a 100644
--- a/tests/python/decompose.ipynb
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@@ -1597,352 +1597,352 @@
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@@ -2802,138 +2802,138 @@
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diff --git a/tests/python/gen.ipynb b/tests/python/gen.ipynb
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diff --git a/tests/python/highlighting.ipynb b/tests/python/highlighting.ipynb
index 209802c1f..3b69aa3ff 100644
--- a/tests/python/highlighting.ipynb
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@@ -247,7 +247,7 @@
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diff --git a/tests/python/ltsmin-dve.ipynb b/tests/python/ltsmin-dve.ipynb
index ec346e1b7..63df611c9 100644
--- a/tests/python/ltsmin-dve.ipynb
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      "execution_count": 21,
@@ -2040,7 +2124,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
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diff --git a/tests/python/ltsmin-pml.ipynb b/tests/python/ltsmin-pml.ipynb
index ac430ec06..2975e0938 100644
--- a/tests/python/ltsmin-pml.ipynb
+++ b/tests/python/ltsmin-pml.ipynb
@@ -38,8 +38,8 @@
       "SpinS Promela Compiler - version 1.1 (3-Feb-2015)\n",
       "(C) University of Twente, Formal Methods and Tools group\n",
       "\n",
-      "Parsing tmpb2gyak36.pml...\n",
-      "Parsing tmpb2gyak36.pml done (0.0 sec)\n",
+      "Parsing tmpfkmh8g4r.pml...\n",
+      "Parsing tmpfkmh8g4r.pml done (0.0 sec)\n",
       "\n",
       "Optimizing graphs...\n",
       "   StateMerging changed 0 states/transitions.\n",
@@ -223,10 +223,10 @@
       "   [..................................................]\n",
       "   [..................................................]\n",
       "   Found          2 /          2 (100.0%) Commuting actions               \n",
-      "Generating guard dependency matrices done (0.1 sec)\n",
+      "Generating guard dependency matrices done (0.0 sec)\n",
       "\n",
-      "Written C code to /home/adl/git/spot/tests/python/tmpb2gyak36.pml.spins.c\n",
-      "Compiled C code to PINS library tmpb2gyak36.pml.spins\n",
+      "Written C code to /home/adl/git/spot/tests/python/tmpfkmh8g4r.pml.spins.c\n",
+      "Compiled C code to PINS library tmpfkmh8g4r.pml.spins\n",
       "\n"
      ]
     }
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+       "<text text-anchor=\"start\" x=\"92\" y=\"-76.8\" font-family=\"Lato\" font-size=\"14.00\">!p0 &amp; !p1</text>\n",
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        "<g id=\"node5\" class=\"node\">\n",
        "<title>1</title>\n",
-       "<ellipse fill=\"#ffffaa\" stroke=\"#000000\" cx=\"472\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
-       "<text text-anchor=\"middle\" x=\"472\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">1</text>\n",
+       "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"464\" cy=\"-18\" rx=\"18\" ry=\"18\"/>\n",
+       "<text text-anchor=\"middle\" x=\"464\" y=\"-14.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
        "</g>\n",
        "<!-- 2&#45;&gt;1 -->\n",
        "<g id=\"edge6\" class=\"edge\">\n",
        "<title>2&#45;&gt;1</title>\n",
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-       "<text text-anchor=\"start\" x=\"379\" y=\"-79.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!p0 &amp; p1</text>\n",
-       "<text text-anchor=\"start\" x=\"398.5\" y=\"-64.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
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+       "<text text-anchor=\"start\" x=\"373\" y=\"-79.8\" font-family=\"Lato\" font-size=\"14.00\">!p0 &amp; p1</text>\n",
+       "<text text-anchor=\"start\" x=\"391.5\" y=\"-64.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
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-       "<text text-anchor=\"start\" x=\"94\" y=\"-39.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">p0 &amp; !p1</text>\n",
-       "<text text-anchor=\"start\" x=\"113.5\" y=\"-24.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
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+       "<text text-anchor=\"start\" x=\"94\" y=\"-39.8\" font-family=\"Lato\" font-size=\"14.00\">p0 &amp; !p1</text>\n",
+       "<text text-anchor=\"start\" x=\"112.5\" y=\"-24.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
        "</g>\n",
        "<!-- 3&#45;&gt;2 -->\n",
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        "<title>3&#45;&gt;2</title>\n",
-       "<path fill=\"none\" stroke=\"#000000\" d=\"M216.2596,-34.8635C241.433,-40.3398 287.5999,-50.3831 316.1587,-56.5959\"/>\n",
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-       "<text text-anchor=\"start\" x=\"246\" y=\"-71.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!p0 &amp; !p1</text>\n",
-       "<text text-anchor=\"start\" x=\"267.5\" y=\"-56.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff7f00\">❷</text>\n",
+       "<path fill=\"none\" stroke=\"black\" d=\"M213.36,-34.8C237.59,-40.26 282.36,-50.36 310.02,-56.59\"/>\n",
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+       "<text text-anchor=\"start\" x=\"242\" y=\"-71.8\" font-family=\"Lato\" font-size=\"14.00\">!p0 &amp; !p1</text>\n",
+       "<text text-anchor=\"start\" x=\"262.5\" y=\"-56.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff7f00\">❷</text>\n",
        "</g>\n",
        "<!-- 3&#45;&gt;3 -->\n",
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        "<title>3&#45;&gt;3</title>\n",
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-       "<text text-anchor=\"start\" x=\"171\" y=\"-85.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!p0 &amp; p1</text>\n",
-       "<text text-anchor=\"start\" x=\"190.5\" y=\"-70.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
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+       "<text text-anchor=\"start\" x=\"169\" y=\"-85.8\" font-family=\"Lato\" font-size=\"14.00\">!p0 &amp; p1</text>\n",
+       "<text text-anchor=\"start\" x=\"187.5\" y=\"-70.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
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        "<!-- 1&#45;&gt;0 -->\n",
        "<g id=\"edge4\" class=\"edge\">\n",
        "<title>1&#45;&gt;0</title>\n",
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-       "<text text-anchor=\"start\" x=\"248\" y=\"-19.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!p0 &amp; p1</text>\n",
-       "<text text-anchor=\"start\" x=\"267.5\" y=\"-4.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
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+       "<polygon fill=\"black\" stroke=\"black\" points=\"66.41,-34.82 68.19,-27.35 68.55,-32.05 70.68,-29.27 70.68,-29.27 70.68,-29.27 68.55,-32.05 73.18,-31.2 66.41,-34.82 66.41,-34.82\"/>\n",
+       "<text text-anchor=\"start\" x=\"244\" y=\"-19.8\" font-family=\"Lato\" font-size=\"14.00\">!p0 &amp; p1</text>\n",
+       "<text text-anchor=\"start\" x=\"262.5\" y=\"-4.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
        "</g>\n",
        "<!-- 1&#45;&gt;2 -->\n",
        "<g id=\"edge5\" class=\"edge\">\n",
        "<title>1&#45;&gt;2</title>\n",
-       "<path fill=\"none\" stroke=\"#000000\" d=\"M454.2068,-13.9399C434.345,-10.3421 401.747,-7.2845 377,-19 367.6034,-23.4485 359.7823,-31.6672 353.8572,-39.737\"/>\n",
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-       "<text text-anchor=\"start\" x=\"377\" y=\"-37.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">!p0 &amp; !p1</text>\n",
-       "<text text-anchor=\"start\" x=\"398.5\" y=\"-22.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
+       "<path fill=\"none\" stroke=\"black\" d=\"M446.09,-14.08C426.86,-10.52 395.03,-7.42 371,-19 361.6,-23.53 353.89,-31.93 348.12,-40.11\"/>\n",
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+       "<text text-anchor=\"start\" x=\"371\" y=\"-37.8\" font-family=\"Lato\" font-size=\"14.00\">!p0 &amp; !p1</text>\n",
+       "<text text-anchor=\"start\" x=\"391.5\" y=\"-22.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
        "</g>\n",
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        "</svg>\n",
@@ -5212,7 +5212,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.4"
+   "version": "3.8.2"
   }
  },
  "nbformat": 4,
diff --git a/tests/python/pdegen.py b/tests/python/pdegen.py
index 9076c4372..760e30508 100644
--- a/tests/python/pdegen.py
+++ b/tests/python/pdegen.py
@@ -334,6 +334,7 @@ assert dot == """digraph "" {
   rankdir=LR
   label="Inf(2) | (Inf(1) & Fin(0))\\n[Rabin-like 2]"
   labelloc="t"
+  node [shape="box",style="rounded",width="0.5"]
   I [label="", style=invis, width=0]
   I -> 0
   0 [label="0 (0)"]
diff --git a/tests/python/satmin.ipynb b/tests/python/satmin.ipynb
index a4effe38f..7b41f1ac2 100644
--- a/tests/python/satmin.ipynb
+++ b/tests/python/satmin.ipynb
@@ -65,198 +65,198 @@
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        " \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n",
-       "<!-- Generated by graphviz version 2.40.1 (20161225.0304)\n",
+       "<!-- Generated by graphviz version 2.43.0 (0)\n",
        " -->\n",
        "<!-- Pages: 1 -->\n",
-       "<svg width=\"595pt\" height=\"336pt\"\n",
-       " viewBox=\"0.00 0.00 594.74 336.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-       "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 332)\">\n",
-       "<polygon fill=\"#ffffff\" stroke=\"transparent\" points=\"-4,4 -4,-332 590.7401,-332 590.7401,4 -4,4\"/>\n",
-       "<text text-anchor=\"start\" x=\"272.3701\" y=\"-313.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">Inf(</text>\n",
-       "<text text-anchor=\"start\" x=\"294.3701\" y=\"-313.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
-       "<text text-anchor=\"start\" x=\"310.3701\" y=\"-313.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">)</text>\n",
-       "<text text-anchor=\"start\" x=\"270.3701\" y=\"-299.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">[Büchi]</text>\n",
+       "<svg width=\"572pt\" height=\"336pt\"\n",
+       " viewBox=\"0.00 0.00 572.00 336.00\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+       "<g id=\"graph0\" class=\"graph\" transform=\"scale(1.0 1.0) rotate(0) translate(4 332)\">\n",
+       "<polygon fill=\"white\" stroke=\"transparent\" points=\"-4,4 -4,-332 568,-332 568,4 -4,4\"/>\n",
+       "<text text-anchor=\"start\" x=\"261.5\" y=\"-313.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
+       "<text text-anchor=\"start\" x=\"282.5\" y=\"-313.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
+       "<text text-anchor=\"start\" x=\"298.5\" y=\"-313.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
+       "<text text-anchor=\"start\" x=\"260.5\" y=\"-299.8\" font-family=\"Lato\" font-size=\"14.00\">[Büchi]</text>\n",
        "<!-- I -->\n",
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        "<title>6</title>\n",
-       "<ellipse fill=\"#ffffaa\" stroke=\"#000000\" cx=\"64.8701\" cy=\"-132\" rx=\"26.7407\" ry=\"26.7407\"/>\n",
-       "<text text-anchor=\"start\" x=\"60.3701\" y=\"-135.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#000000\">6</text>\n",
-       "<text text-anchor=\"start\" x=\"56.8701\" y=\"-120.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
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-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1dc82bf750> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f461c46de40> >"
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@@ -1481,7 +1481,7 @@
        "      <td>224707</td>\n",
        "      <td>9</td>\n",
        "      <td>0</td>\n",
-       "      <td>8</td>\n",
+       "      <td>7</td>\n",
        "      <td>0</td>\n",
        "    </tr>\n",
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@@ -1493,7 +1493,7 @@
        "      <td>32</td>\n",
        "      <td>2008</td>\n",
        "      <td>155020</td>\n",
-       "      <td>7</td>\n",
+       "      <td>6</td>\n",
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        "      <td>7</td>\n",
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@@ -1510,8 +1510,8 @@
        "\n",
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-       "1  224707        9       0        8       0  \n",
-       "2  155020        7       0        7       0  "
+       "1  224707        9       0        7       0  \n",
+       "2  155020        6       0        7       0  "
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        "      <td>173183</td>\n",
-       "      <td>6</td>\n",
-       "      <td>1</td>\n",
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        "      <td>32</td>\n",
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        "2            4             3              NaN   NaN         NaN       363   \n",
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-       "1   45412        2       0        1       0  \n",
+       "0  173183        7       0        4       0  \n",
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        "      <td>173183</td>\n",
-       "      <td>6</td>\n",
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        "\n",
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-       "0  173183        6       1        3       0   \n",
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        "\n",
        "                                           automaton  \n",
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@@ -4305,7 +4305,7 @@
        "      <td>56</td>\n",
        "      <td>1379</td>\n",
        "      <td>89168</td>\n",
-       "      <td>4</td>\n",
+       "      <td>3</td>\n",
        "      <td>0</td>\n",
        "      <td>1</td>\n",
        "      <td>0</td>\n",
@@ -4319,7 +4319,7 @@
        "0            2             7                7    23          56      1379   \n",
        "\n",
        "  clauses enc.user enc.sys sat.user sat.sys  \n",
-       "0   89168        4       0        1       0  "
+       "0   89168        3       0        1       0  "
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