). The position types are:

        * 'outward': place the spine out from the data area by the specified
          number of points. (Negative values place the spine inwards.)
        * 'axes': place the spine at the specified Axes coordinate (0 to 1).
        * 'data': place the spine at the specified data coordinate.

        Additionally, shorthand notations define a special positions:

        * 'center' -> ``('axes', 0.5)``
        * 'zero' -> ``('data', 0.0)``

        Examples
        --------
        :doc:`/gallery/spines/spine_placement_demo`
        )