If the magnitude of a flow is less the *tolerance*
                            for the instance of :class:`Sankey`, the flow is
                            skipped and its tip will be at the center of the
                            diagram.
          *text*            :class:`~matplotlib.text.Text` instance for the
                            label of the diagram
          *texts*           list of :class:`~matplotlib.text.Text` instances
                            for the labels of flows
          ===============   ===================================================

        See Also
        --------
        Sankey.add
        r