Often, conference and journal style files require Type-1 fonts. Per default, matplotlib uses type 3 fonts.
One thing that one could do would be to change the rcparams to pdf.fonttype=42,
plt.rcParams["pdf.fonttype"] = 42 # alternative would be 3
which generates type 42 fonts. It is not clear entirely whether this is sufficient for the type 1 rule. That would require checking, though.
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