Cambiar las fuentes predeterminadas en el archivo matploitlibrc
''' The basic format of the file is in the form of "option : value". For example, to keep the
legend always on the right, we put:
legend.loc : right'''
''' to change the default fonts to Arial,
search the file for fonts,then at that
location, just add the following lines without # or ##'''.
font.family : sans-serif
font.sans-serif : Arial
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