def METHOD_NAME(
        aval, bval, min_mag, max_mag, dmag,
        catalogue=None, completeness=None, filename=None,
        figure_size=(8, 6), filetype='png', dpi=300, ax=None):
    """
    Plots a Gutenberg-Richter model
    """
    input_model = TruncatedGRMFD(min_mag, max_mag, dmag, aval, bval)
    if not catalogue:
        # Plot only the modelled recurrence
        annual_rates, cumulative_rates = _get_recurrence_model(input_model)
        if ax is None:
            fig, ax = plt.subplots(figsize=figure_size)
        else:
            fig = ax.get_figure()
        ax.semilogy(annual_rates[:, 0], annual_rates[:, 1], 'b-')
        ax.semilogy(annual_rates[:, 0], cumulative_rates, 'r-')
        ax.xlabel('Magnitude')
        ax.set_ylabel('Annual Rate')
        ax.set_legend(['Incremental Rate', 'Cumulative Rate'])
        _save_image(fig, filename, filetype, dpi)
    else:
        completeness = _check_completeness_table(completeness, catalogue)
        plot_recurrence_model(
            input_model, catalogue, completeness, dmag, filename=filename,
            figure_size=figure_size, filetype=filetype, dpi=dpi, ax=ax)