Axes.fill_betweenx(self, y, x1, x2=0, where=None, step=None, interpolate=False, *, data=None, **kwargs)
[source]
Fill the area between two vertical curves.
The curves are defined by the points (x1, y) and (x2, y). This creates one or multiple polygons describing the filled area.
You may exclude some vertical sections from filling using where.
By default, the edges connect the given points directly. Use step if the filling should be a step function, i.e. constant in between y.
Parameters: 
 

Returns: 
 
Other Parameters: 

See also
fill_between
Note
In addition to the above described arguments, this function can take a data keyword argument. If such a data argument is given, the following arguments are replaced by data[<arg>]:
Objects passed as data must support item access (data[<arg>]
) and membership test (<arg> in data
).
matplotlib.axes.Axes.fill_betweenx
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https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.axes.Axes.fill_betweenx.html