mappable : ContourSet, etc.
Matplotlib object to create colorbar for. None will use
the last mappable plotted.
orientation : ‘vertical’ or ‘horizontal’
label : str
Colorbar label. None will use: ‘long_name’ (‘units’) for
the last field plotted or ‘’ if the field does not have these
keys.
cax : axis
Axes object into which the colorbar will be drawn. None will use
the current axis.
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