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matplotlib.axes.Axes.format_xdata
- Axes.- format_xdata(x)
- 
    Return x formatted as an x-value. This function will use the fmt_xdataattribute if it is not None, else will fall back on the xaxis major formatter.
Examples using matplotlib.axes.Axes.format_xdata
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 https://matplotlib.org/3.4.3/api/_as_gen/matplotlib.axes.Axes.format_xdata.html