@staticmethod
def draw_group(data, panel_params, coord, ax, **params):
    """
        Plot data belonging to a group.

        Parameters
        ----------
        data : dataframe
            Data to be plotted by this geom. This is the
            dataframe created in the plot_build pipeline.
        panel_params : dict
            The scale information as may be required by the
            axes. At this point, that information is about
            ranges, ticks and labels. Keys of interest to
            the geom are::

                'x_range'  # tuple
                'y_range'  # tuple

        coord : coord
            Coordinate (e.g. coord_cartesian) system of the
            geom.
        ax : axes
            Axes on which to plot.
        params : dict
            Combined parameters for the geom and stat. Also
            includes the 'zorder'.
        """
    msg = 'The geom should implement this method.'
    raise NotImplementedError(msg)
