def showModel(self, model, ax=None, **kwargs):
        """Show a model.

        Draw model into a given axes or show inversion result from last run.
        Forwards on default to the self.fop.drawModel function
        of the modelling operator.
        If there is no function given, you have to override this method.

        Parameters
        ----------
        ax : mpl axes
            Axes object to draw into. Create a new if its not given.

        model : iterable
            Model data to be draw.

        Returns
        -------
        ax, cbar
        """
        if ax is None:
            fig, ax = pg.plt.subplots()

        ax, cBar = self.fop.drawModel(ax, model, **kwargs)
        return ax, cBar