Index: nbval-0.9.6/tests/sanitize_defaults.cfg
===================================================================
--- nbval-0.9.6.orig/tests/sanitize_defaults.cfg
+++ nbval-0.9.6/tests/sanitize_defaults.cfg
@@ -13,4 +13,8 @@ replace: TIMESTAMP
 
 [Memory addresses]
 regex: (<[a-zA-Z_][0-9a-zA-Z_.]* at )(0x[0-9a-fA-F]+)(>)
-replace: \1MEMORY_ADDRESS\3
\ No newline at end of file
+replace: \1MEMORY_ADDRESS\3
+
+[Matplotlib figure size]
+regex: (Figure size )\d+x\d+( with \d+ Axes)
+replace: \1WIDTHxHEIGHT\2