xlabel, ylabel : str or None, optional
Userprovided lables for the xaxis and yaxis. If None (default),
other values are used depending on the status of the kwarg other.
line : str {‘45’, ‘s’, ‘r’, q’} or None, optional
Options for the reference line to which the data is compared:
 ‘45’  45degree line
 ‘s’  standardized line, the expected order statistics are scaled
by the standard deviation of the given sample and have the mean
added to them
 ‘r’  A regression line is fit
 ‘q’  A line is fit through the quartiles.
 None  by default no reference line is added to the plot.
other : ProbPlot instance, arraylike, or None, optional
If provided, the sample quantiles of this ProbPlot instance are
plotted against the sample quantiles of the other ProbPlot
instance. If an arraylike object is provided, it will be turned
into a ProbPlot instance using default parameters. If not provided
(default), the theoretical quantiles are used.
ax : Matplotlib AxesSubplot instance, optional
If given, this subplot is used to plot in instead of a new figure
being created.
**plotkwargs : additional matplotlib arguments to be passed to the
