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  • How did you get this figure? According your code, numbers should be centered inside circles. Commented Nov 26, 2014 at 7:38
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    Really good question. I found it caused by different pdf to png convert tool. one is from inkscape and another is from convert. Not sure if it caused by the default font. I have updated the output from both tool. code is the same but image is really differ. Commented Nov 26, 2014 at 19:16
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    @Beatlej Inkscape can't use embedded font... Commented Nov 26, 2014 at 23:50