diff --git a/wrap/python/spot.py b/wrap/python/spot.py
index 25855977d..417ac2383 100644
--- a/wrap/python/spot.py
+++ b/wrap/python/spot.py
@@ -46,6 +46,7 @@ def _extend(*classes):
         return classes[0]
     return wrap
 
+_show_default = None
 
 def setup(**kwargs):
     """Configure Spot for fancy display.
@@ -68,6 +69,8 @@ def setup(**kwargs):
         (default: '10.2,5')
     font : str
         the font to use in the GraphViz output (default: 'Lato')
+    show_default : str
+        default options for show()
     """
     import os
 
@@ -78,6 +81,8 @@ def setup(**kwargs):
 
     bullets = 'B' if kwargs.get('bullets', True) else ''
     d = 'rf({})'.format(kwargs.get('font', 'Lato')) + bullets
+    global _show_default
+    _show_default = kwargs.get('show_default', None)
     os.environ['SPOT_DOTDEFAULT'] = d
 
 
@@ -122,11 +127,17 @@ class twa:
     def _repr_svg_(self, opt=None):
         """Output the automaton as SVG"""
         ostr = ostringstream()
+        if opt is None:
+            global _show_default
+            opt = _show_default
         print_dot(ostr, self, opt)
         return _ostream_to_svg(ostr)
 
     def show(self, opt=None):
         """Display the automaton as SVG, in the IPython/Jupyter notebook"""
+        if opt is None:
+            global _show_default
+            opt = _show_default
         # Load the SVG function only if we need it. This way the
         # bindings can still be used outside of IPython if IPython is
         # not installed.
diff --git a/wrap/python/tests/decompose.ipynb b/wrap/python/tests/decompose.ipynb
index a153db058..e073a50e4 100644
--- a/wrap/python/tests/decompose.ipynb
+++ b/wrap/python/tests/decompose.ipynb
@@ -18,7 +18,7 @@
    "version": "3.4.3+"
   },
   "name": "",
-  "signature": "sha256:3d73c80c329ce7b32e9edaa2470fce5e27744462f43431affbbb771deb92aff2"
+  "signature": "sha256:b3b36fe78a04d878ed9e49766fcef5febec464e5c25ad302dd1f446e45b2fd36"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -31,7 +31,7 @@
      "input": [
       "from IPython.display import display\n",
       "import spot\n",
-      "spot.setup()"
+      "spot.setup(show_default='.bans')"
      ],
      "language": "python",
      "metadata": {},
@@ -63,7 +63,7 @@
      "collapsed": false,
      "input": [
       "aut = spot.translate('(Ga -> Gb) W c')\n",
-      "aut.show('.sa')"
+      "aut"
      ],
      "language": "python",
      "metadata": {},
@@ -73,137 +73,144 @@
        "output_type": "pyout",
        "prompt_number": 2,
        "svg": [
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-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 256.243)\">\n",
+        "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n",
+        "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n",
+        " \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n",
+        "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
+        " -->\n",
+        "<!-- Title: G Pages: 1 -->\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"172\" y=\"-185.043\">a &amp; !c</text>\n",
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         "</g>\n",
         "</g>\n",
-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3f4c0c588>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0f7a50> >"
        ]
       }
      ],
@@ -228,8 +235,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "sweak = spot.decompose_strength(aut, 'w')\n",
-      "sweak.show('.sa')"
+      "spot.decompose_strength(aut, 'w')"
      ],
      "language": "python",
      "metadata": {},
@@ -239,82 +245,89 @@
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        "prompt_number": 3,
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         "</g>\n",
         "</g>\n",
-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc364da0>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0f79c0> >"
        ]
       }
      ],
@@ -331,8 +344,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "term = spot.decompose_strength(aut, 't')\n",
-      "term.show('.sa')"
+      "spot.decompose_strength(aut, 't')"
      ],
      "language": "python",
      "metadata": {},
@@ -342,114 +354,121 @@
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        "prompt_number": 4,
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-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc38b860>"
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@@ -466,8 +485,7 @@
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      "collapsed": false,
      "input": [
-      "strong = spot.decompose_strength(aut, 's')\n",
-      "strong.show('.sa')"
+      "strong = spot.decompose_strength(aut, 's'); strong"
      ],
      "language": "python",
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@@ -477,63 +495,70 @@
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-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc3a0518>"
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@@ -626,7 +657,7 @@
       "for opt in ('sw', 'st', 'wt'):\n",
       "    a = spot.decompose_strength(aut, opt)\n",
       "    a.set_name(\"option: \" + opt)\n",
-      "    display(a.show('.asn'))"
+      "    display(a)"
      ],
      "language": "python",
      "metadata": {},
@@ -635,338 +666,359 @@
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        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc367c50>"
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"36\" y=\"-185.043\">!a &amp; !c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"105\" y=\"-149.043\">a &amp; !c</text>\n",
+        "<g id=\"edge4\" class=\"edge\"><title>0&#45;&gt;2</title>\n",
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-        "<g class=\"edge\" id=\"edge6\"><title>1-&gt;1</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"437.362\" y=\"-211.8\">a &amp; b &amp; !c</text>\n",
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         "</g>\n",
         "</g>\n",
-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc367978>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcf801c60> >"
        ]
       }
      ],
@@ -1384,7 +1443,7 @@
       "for (name, opt) in (('terminal', 't'), ('strictly weak', 'w'), ('strong', 's')):\n",
       "    a = spot.decompose_strength(aut, opt)\n",
       "    a.set_name(name)\n",
-      "    display(a.show('.basn'))"
+      "    display(a)"
      ],
      "language": "python",
      "metadata": {},
@@ -1393,659 +1452,680 @@
        "metadata": {},
        "output_type": "display_data",
        "svg": [
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-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(0.6 0.6) rotate(0) translate(4 596)\">\n",
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+        "<!-- Title: G Pages: 1 -->\n",
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-        "<polygon fill=\"none\" points=\"168,-355 168,-407 220,-407 220,-355 168,-355\" stroke=\"black\"/>\n",
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-        "<polygon fill=\"none\" points=\"168,-128 168,-180 220,-180 220,-128 168,-128\" stroke=\"black\"/>\n",
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+        "<polygon fill=\"none\" stroke=\"black\" points=\"30,-260 30,-312 82,-312 82,-260 30,-260\"/>\n",
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+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
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+        "<text text-anchor=\"start\" x=\"485.5\" y=\"-544.8\" font-family=\"Lato\" font-size=\"14.00\">c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"489\" y=\"-285.3\">3</text>\n",
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+        "<text text-anchor=\"middle\" x=\"489\" y=\"-285.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"243\" y=\"-246.8\">!a &amp; !c</text>\n",
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+        "<path fill=\"none\" stroke=\"black\" d=\"M73.4476,-280.48C103.903,-270.584 171.326,-250.183 230,-243 317.664,-232.269 420.724,-264.26 465.428,-280.354\"/>\n",
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+        "<text text-anchor=\"start\" x=\"243\" y=\"-246.8\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"772\" y=\"-234.3\">7</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"772\" y=\"-30.3\">8</text>\n",
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+        "<text text-anchor=\"middle\" x=\"772\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">8</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"808\" y=\"-87.8\">!a</text>\n",
+        "<g id=\"edge34\" class=\"edge\"><title>8&#45;&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"686.5\" y=\"-178.3\">a &amp; !b</text>\n",
+        "<g id=\"edge33\" class=\"edge\"><title>8&#45;&gt;7</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"755\" y=\"-73.8\">a &amp; b</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"334\" y=\"-285.3\">5</text>\n",
+        "<g id=\"node6\" class=\"node\"><title>5</title>\n",
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+        "<text text-anchor=\"middle\" x=\"334\" y=\"-285.3\" font-family=\"Lato\" font-size=\"14.00\">5</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"620\" y=\"-371.8\">!a &amp; c</text>\n",
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-        "<g class=\"edge\" id=\"edge26\"><title>6-&gt;7</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"316\" y=\"-114.472\">a &amp; !c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"385\" y=\"-58.4719\">!a &amp; !c</text>\n",
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+        "<text text-anchor=\"start\" x=\"385\" y=\"-58.4719\" font-family=\"Lato\" font-size=\"14.00\">!a &amp; !c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"372\" y=\"-81.4719\">a &amp; !b &amp; !c</text>\n",
+        "<g id=\"edge11\" class=\"edge\"><title>3&#45;&gt;4</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M472.087,-64.1151C462.409,-67.6912 449.698,-71.7877 438,-73.6719 411.426,-77.9524 380.495,-77.5451 359.516,-76.4828\"/>\n",
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-        "<g class=\"edge\" id=\"edge12\"><title>3-&gt;3</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"469\" y=\"-97.4719\">!a &amp; !c</text>\n",
+        "<g id=\"edge12\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"638\" y=\"-104.972\">5</text>\n",
+        "<g id=\"node6\" class=\"node\"><title>5</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"638\" cy=\"-108.672\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"638\" y=\"-104.972\" font-family=\"Lato\" font-size=\"14.00\">5</text>\n",
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-        "<g class=\"edge\" id=\"edge13\"><title>3-&gt;5</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"540\" y=\"-72.4719\">a &amp; b &amp; !c</text>\n",
+        "<g id=\"edge13\" class=\"edge\"><title>3&#45;&gt;5</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M507.017,-55.6165C529.949,-53.645 571.419,-52.9475 602,-68.6719 610.463,-73.0234 617.787,-80.36 623.517,-87.5705\"/>\n",
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-        "<g class=\"edge\" id=\"edge19\"><title>5-&gt;6</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"674\" y=\"-161.472\">a &amp; b &amp; c</text>\n",
+        "<g id=\"edge19\" class=\"edge\"><title>5&#45;&gt;6</title>\n",
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-        "<g class=\"edge\" id=\"edge16\"><title>5-&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"456\" y=\"-124.472\">a &amp; !b &amp; !c</text>\n",
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-        "<g class=\"edge\" id=\"edge17\"><title>5-&gt;3</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"551\" y=\"-105.472\">!a &amp; !c</text>\n",
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-        "<g class=\"edge\" id=\"edge18\"><title>5-&gt;5</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"607\" y=\"-148.472\">a &amp; b &amp; !c</text>\n",
+        "<g id=\"edge18\" class=\"edge\"><title>5&#45;&gt;5</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"245\" y=\"-69.4719\">a &amp; !c</text>\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;4</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"314\" y=\"-36.4719\">!a &amp; !c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"644.492\" y=\"-429.8\">!a &amp; c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"555.622\" y=\"-291.8\">a &amp; b &amp; !c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"487.681\" y=\"-486.8\">a &amp; c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"472.681\" y=\"-165.8\">a &amp; !b &amp; c</text>\n",
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-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc346278>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc11ac00> >"
        ]
       }
      ],
@@ -2393,7 +2480,7 @@
       "for (name, opt) in (('terminal', 't'), ('strictly weak', 'w'), ('strong', 's')):\n",
       "    a = spot.decompose_strength(aut, opt).postprocess('deterministic', 'SBAcc')\n",
       "    a.set_name(name)\n",
-      "    display(a.show('.basn'))"
+      "    display(a)"
      ],
      "language": "python",
      "metadata": {},
@@ -2402,400 +2489,421 @@
        "metadata": {},
        "output_type": "display_data",
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-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc399438>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0c2120> >"
        ]
       }
      ],
@@ -3158,7 +3273,7 @@
       "for (name, opt) in (('terminal', 't'), ('strictly weak', 'w'), ('strong', 's')):\n",
       "    a = spot.decompose_strength(aut, opt)\n",
       "    a.set_name(name)\n",
-      "    display(a.show('.basn'))"
+      "    display(a)"
      ],
      "language": "python",
      "metadata": {},
@@ -3167,543 +3282,564 @@
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        "output_type": "display_data",
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+      "spot.decompose_strength(aut, 'st')"
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-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc3999e8>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0c2210> >"
        ]
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@@ -4026,7 +4169,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "aut = spot.translate('(Gb|c) R a', 'any'); aut.show('.as')"
+      "aut = spot.translate('(Gb|c) R a', 'any'); aut"
      ],
      "language": "python",
      "metadata": {},
@@ -4036,76 +4179,83 @@
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+        "<text text-anchor=\"start\" x=\"107\" y=\"-106.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; c</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"190\" y=\"-30.3\">2</text>\n",
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+        "<text text-anchor=\"middle\" x=\"190\" y=\"-30.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"190\" y=\"-166.8\">1</text>\n",
+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
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+        "<text text-anchor=\"middle\" x=\"190\" y=\"-166.8\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
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-        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;2</title>\n",
-        "<path d=\"M179.087,-48.4167C175.276,-59.166 178.914,-70 190,-70 198.661,-70 202.776,-63.3875 202.344,-55.3688\" fill=\"none\" stroke=\"black\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"185.5\" y=\"-73.8\">b</text>\n",
+        "<g id=\"edge6\" class=\"edge\"><title>2&#45;&gt;2</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M179.087,-48.4167C175.276,-59.166 178.914,-70 190,-70 198.661,-70 202.776,-63.3875 202.344,-55.3688\"/>\n",
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+        "<text text-anchor=\"start\" x=\"185.5\" y=\"-73.8\" font-family=\"Lato\" font-size=\"14.00\">b</text>\n",
         "</g>\n",
         "</g>\n",
-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3f4077550>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0c2390> >"
        ]
       }
      ],
@@ -4128,7 +4278,7 @@
      "collapsed": false,
      "input": [
       "for opt in ('w', 't'):\n",
-      "    display(spot.decompose_strength(aut, opt).show('.bas'))"
+      "    display(spot.decompose_strength(aut, opt))"
      ],
      "language": "python",
      "metadata": {},
@@ -4137,119 +4287,133 @@
        "metadata": {},
        "output_type": "display_data",
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-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 146)\">\n",
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+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 146)\">\n",
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+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M1.04557,-43C1.94668,-43 16.0699,-43 30.6965,-43\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.8616,-43 30.8617,-46.1501 34.3616,-43 30.8616,-43.0001 30.8616,-43.0001 30.8616,-43.0001 34.3616,-43 30.8616,-39.8501 37.8616,-43 37.8616,-43\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"212.11\" y=\"-91.6701\">b</text>\n",
+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M203.074,-66.5464C201.403,-77.8722 205.915,-87.8701 216.61,-87.8701 224.966,-87.8701 229.548,-81.7678 230.355,-73.6976\"/>\n",
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         "</g>\n",
         "</g>\n",
-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3f4079b38>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0c23f0> >"
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       },
       {
        "metadata": {},
        "output_type": "display_data",
        "svg": [
-        "<svg height=\"150pt\" viewBox=\"0.00 0.00 219.74 150.00\" width=\"220pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 146)\">\n",
+        "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n",
+        "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n",
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+        " -->\n",
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+        "<svg width=\"220pt\" height=\"150pt\"\n",
+        " viewBox=\"0.00 0.00 219.74 150.00\" 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(4 146)\">\n",
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-        "<polygon fill=\"white\" points=\"-4,4 -4,-146 215.74,-146 215.74,4 -4,4\" stroke=\"none\"/>\n",
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+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-146 215.74,-146 215.74,4 -4,4\"/>\n",
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+        "<polygon fill=\"none\" stroke=\"green\" points=\"134,-8 134,-111 203.74,-111 203.74,-8 134,-8\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-39.3\">0</text>\n",
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+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-43\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-39.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
         "</g>\n",
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-        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
-        "<path d=\"M1.15491,-43C2.79388,-43 17.1543,-43 30.6317,-43\" fill=\"none\" stroke=\"black\"/>\n",
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+        "<path fill=\"none\" stroke=\"black\" d=\"M1.15491,-42C2.79388,-42 17.1543,-42 30.6317,-42\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-42 30.9419,-45.1501 34.4419,-42 30.9419,-42.0001 30.9419,-42.0001 30.9419,-42.0001 34.4419,-42 30.9418,-38.8501 37.9419,-42 37.9419,-42\"/>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;0 -->\n",
-        "<g class=\"edge\" id=\"edge2\"><title>0-&gt;0</title>\n",
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+        "<g id=\"edge2\" class=\"edge\"><title>0&#45;&gt;0</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M49.6208,-59.0373C48.3189,-68.8579 50.4453,-78 56,-78 60.166,-78 62.4036,-72.8576 62.7128,-66.1433\"/>\n",
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+        "<text text-anchor=\"start\" x=\"52.5\" y=\"-81.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
         "<!-- 1 -->\n",
-        "<g class=\"node\" id=\"node4\"><title>1</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"139\" y=\"-38.3\">1</text>\n",
+        "<g id=\"node4\" class=\"node\"><title>1</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-42\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"139\" y=\"-38.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;1</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-45.8\">!a</text>\n",
+        "<g id=\"edge3\" class=\"edge\"><title>0&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M74.178,-42C85.6688,-42 100.959,-42 113.693,-42\"/>\n",
+        "<polygon fill=\"black\" stroke=\"black\" points=\"120.847,-42 113.847,-45.1501 117.347,-42 113.847,-42.0001 113.847,-42.0001 113.847,-42.0001 117.347,-42 113.847,-38.8501 120.847,-42 120.847,-42\"/>\n",
+        "<text text-anchor=\"start\" x=\"92\" y=\"-45.8\" font-family=\"Lato\" font-size=\"14.00\">!a</text>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"310\" y=\"-31.3\">3</text>\n",
+        "<g id=\"node3\" class=\"node\"><title>3</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"310\" cy=\"-35\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"310\" y=\"-31.3\" font-family=\"Lato\" font-size=\"14.00\">3</text>\n",
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+        "<g id=\"edge8\" class=\"edge\"><title>3&#45;&gt;3</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M302.969,-51.6641C301.406,-61.625 303.75,-71 310,-71 314.688,-71 317.178,-65.7266 317.471,-58.8876\"/>\n",
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+        "<g id=\"edge4\" class=\"edge\"><title>1&#45;&gt;1</title>\n",
+        "<path fill=\"none\" stroke=\"black\" d=\"M131.969,-58.6641C130.406,-68.625 132.75,-78 139,-78 143.688,-78 146.178,-72.7266 146.471,-65.8876\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"227\" y=\"-31.3\">2</text>\n",
+        "<g id=\"node5\" class=\"node\"><title>2</title>\n",
+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"227\" cy=\"-35\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"227\" y=\"-31.3\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
         "</g>\n",
         "<!-- 1&#45;&gt;2 -->\n",
-        "<g class=\"edge\" id=\"edge5\"><title>1-&gt;2</title>\n",
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+        "<g id=\"edge5\" class=\"edge\"><title>1&#45;&gt;2</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"263\" y=\"-38.8\">!a</text>\n",
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-        "<g class=\"edge\" id=\"edge6\"><title>2-&gt;1</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"179.5\" y=\"-69.8\">a</text>\n",
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+        "<text text-anchor=\"start\" x=\"179.5\" y=\"-69.8\" font-family=\"Lato\" font-size=\"14.00\">a</text>\n",
         "</g>\n",
         "</g>\n",
-        "</svg>"
+        "</svg>\n"
        ],
        "text": [
-        "<IPython.core.display.SVG at 0x7fe3f408bf28>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc0c24e0> >"
        ]
       }
      ],
@@ -4500,7 +4678,7 @@
       "    a = spot.decompose_strength(aut, opt)\n",
       "    if a:\n",
       "        a.set_name(name)\n",
-      "        display(a.show('.asn'))\n",
+      "        display(a)\n",
       "    else:\n",
       "        print(\"no output for \" + name)"
      ],
@@ -4511,178 +4689,192 @@
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        "output_type": "display_data",
        "svg": [
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-        "<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 173)\">\n",
+        "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n",
+        "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n",
+        " \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n",
+        "<!-- Generated by graphviz version 2.38.0 (20140413.2041)\n",
+        " -->\n",
+        "<!-- Title: G Pages: 1 -->\n",
+        "<svg width=\"347pt\" height=\"177pt\"\n",
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+        "<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 173)\">\n",
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-        "<polygon fill=\"white\" points=\"-4,4 -4,-173 343,-173 343,4 -4,4\" stroke=\"none\"/>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"143.5\" y=\"-154.8\">terminal</text>\n",
-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"148.5\" y=\"-140.8\">Inf(</text>\n",
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-        "<polygon fill=\"none\" points=\"279,-25 279,-125 331,-125 331,-25 279,-25\" stroke=\"green\"/>\n",
+        "<polygon fill=\"white\" stroke=\"none\" points=\"-4,4 -4,-173 343,-173 343,4 -4,4\"/>\n",
+        "<text text-anchor=\"start\" x=\"143.5\" y=\"-154.8\" font-family=\"Lato\" font-size=\"14.00\">terminal</text>\n",
+        "<text text-anchor=\"start\" x=\"148.5\" y=\"-140.8\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
+        "<text text-anchor=\"start\" x=\"170.5\" y=\"-140.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#5da5da\">\u24ff</text>\n",
+        "<text text-anchor=\"start\" x=\"186.5\" y=\"-140.8\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
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+        "<polygon fill=\"none\" stroke=\"green\" points=\"279,-25 279,-125 331,-125 331,-25 279,-25\"/>\n",
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-        "<polygon fill=\"none\" points=\"113,-8 113,-95 248,-95 248,-8 113,-8\" stroke=\"red\"/>\n",
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-        "<g class=\"cluster\" id=\"clust3\"><title>cluster_2</title>\n",
-        "<polygon fill=\"none\" points=\"30,-9 30,-94 82,-94 82,-9 30,-9\" stroke=\"red\"/>\n",
+        "<g id=\"clust3\" class=\"cluster\"><title>cluster_2</title>\n",
+        "<polygon fill=\"none\" stroke=\"red\" points=\"30,-9 30,-94 82,-94 82,-9 30,-9\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"56\" y=\"-31.3\">0</text>\n",
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+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"56\" cy=\"-35\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"56\" y=\"-31.3\" font-family=\"Lato\" font-size=\"14.00\">0</text>\n",
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-        "<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
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+        "<g id=\"edge1\" class=\"edge\"><title>I&#45;&gt;0</title>\n",
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+        "<polygon fill=\"black\" stroke=\"black\" points=\"37.9419,-35 30.9419,-38.1501 34.4419,-35 30.9419,-35.0001 30.9419,-35.0001 30.9419,-35.0001 34.4419,-35 30.9418,-31.8501 37.9419,-35 37.9419,-35\"/>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"middle\" x=\"139\" y=\"-31.3\">1</text>\n",
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+        "<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"139\" cy=\"-35\" rx=\"18\" ry=\"18\"/>\n",
+        "<text text-anchor=\"middle\" x=\"139\" y=\"-31.3\" font-family=\"Lato\" font-size=\"14.00\">1</text>\n",
         "</g>\n",
         "<!-- 0&#45;&gt;1 -->\n",
-        "<g class=\"edge\" id=\"edge3\"><title>0-&gt;1</title>\n",
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-        "<text font-family=\"Lato\" font-size=\"14.00\" text-anchor=\"start\" x=\"92\" y=\"-38.8\">!a</text>\n",
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        "text": [
-        "<IPython.core.display.SVG at 0x7fe3fc399748>"
+        "<spot_impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f8dcc11a450> >"
        ]
       }
      ],
      "prompt_number": 20
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 20
     }
    ],
    "metadata": {}