def _better_page_name(old_name):
    """Use a longer, more descriptive name for the pages."""
    if old_name == 'zonal_mean_xy':
        return 'Zonal mean line plots'
    elif old_name == 'zonal_mean_2d':
        return 'Pressure-Latitude zonal mean contour plots'
    elif old_name == 'lat_lon':
        return 'Latitude-Longitude contour maps'
    elif old_name == 'polar':
        return 'Polar contour maps'
    elif old_name == 'cosp_histogram':
        return 'CloudTopHeight-Tau joint histograms'
    else:
        return old_name