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diff -ru epydoc-code.orig/epydoc/src/epydoc/docwriter/dotgraph.py epydoc-code/epydoc/src/epydoc/docwriter/dotgraph.py
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--- epydoc-code.orig/epydoc/src/epydoc/docwriter/dotgraph.py	2015-10-02 20:18:48.213890123 +0100
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+++ epydoc-code/epydoc/src/epydoc/docwriter/dotgraph.py	2015-10-02 20:33:00.582257332 +0100
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@@ -93,7 +93,7 @@
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     """The default minimum size in inches (width,height) for graphs
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     when rendering with `to_html()`"""
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-    DEFAULT_HTML_IMAGE_FORMAT = 'gif'
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+    DEFAULT_HTML_IMAGE_FORMAT = 'png'
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     """The default format used to generate images by `to_html()`"""
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     def __init__(self, title, body='', node_defaults=None,