Plot scalp projections of the sources.

        This function only plots the topos. Use in combination with connectivity plotting.

        Parameters
        ----------
        fig : {None, Figure object}, optional
            Where to plot the topos. f set to **None**, a new figure is created. Otherwise plot into the provided
            figure object.

        Returns
        -------
        fig : Figure object
            Instance of the figure in which was plotted.

def plot_connectivity_topos(self, fig=None):
        """ Plot scalp projections of the sources.

        This function only plots the topos. Use in combination with connectivity plotting.

        Parameters
        ----------
        fig : {None, Figure object}, optional
            Where to plot the topos. f set to **None**, a new figure is created. Otherwise plot into the provided
            figure object.

        Returns
        -------
        fig : Figure object
            Instance of the figure in which was plotted.
        """
        self._prepare_plots(True, False)
        if self.plot_outside_topo:
            fig = self.plotting.plot_connectivity_topos('outside', self.topo_, self.mixmaps_, fig)
        elif self.plot_diagonal == 'topo':
            fig = self.plotting.plot_connectivity_topos('diagonal', self.topo_, self.mixmaps_, fig)
        return fig