the top and bottom, and the length of
            all other arrows will be justified accordingly.  The *pathlengths*
            are not applied to the horizontal inputs and outputs.

        prior : int
            Index of the prior diagram to which this diagram should be
            connected.

        connect : (int, int)
            A (prior, this) tuple indexing the flow of the prior diagram and
            the flow of this diagram which should be connected.  If this is the
            first diagram or *prior* is *None*, *connect* will be ignored.

        rotation : float
            Angle of rotation of the diagram in degrees.  The interpretation of
            the *orientations* argument will be rotated accordingly (e.g., if
            *rotation* == 90, an *orientations* entry of 1 means to/from the
            left).  *rotation* is ignored if this diagram is connected to an
            existing one (using *prior* and *connect*).

        Returns
        -------
        Sankey
            The current `.Sankey` instance.

        Other Parameters
        ----------------
        **kwargs
           Additional keyword arguments set `matplotlib.patches.PathPatch`
           properties, listed below.  For example, one may want to use
           ``fill=False`` or ``label="A legend entry"``.

        %(Patch:kwdoc)s

        See Also
        --------
        Sankey.finish
        Nr