Dear all,

    The following TeX expression did not produce any error message with 
matplotlib versions 0.87.3 - 0.90.2 :

    r'$Wavenumber,\ [\ cm^{-1}\ ]$'

    The following error is produced with version 0.91.2 :

    <class 'matplotlib.pyparsing.ParseFatalException'>: Expected end of 
math '$'
    $Wavenumber,\ [\ cm^{-1}\ ]$ (at char 0), (line:1, col:1)

    The problem comes about because of the square brackets. Could 
everyone please explain me how to handle this situation (without placing 
the brackets outside of '$$') ?


    Thanks in advance,
    Dr. Maxim Fedorovsky.

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