Plot ratio of two conductivity directions.

def plot_ratio(cid, ax, plotman, title, alpha, vmin, vmax,
               xmin, xmax, zmin, zmax, xunit, cbtiks, elecs):
    '''Plot ratio of two conductivity directions.
    '''
    # handle options
    cblabel = 'anisotropy ratio'
    zlabel = 'z [' + xunit + ']'
    xlabel = 'x [' + xunit + ']'
    # cm = 'brg'
    cm = 'RdYlGn'
    xmin, xmax, zmin, zmax, vmin, vmax = check_minmax(
            plotman,
            cid,
            xmin, xmax,
            zmin, zmax,
            vmin, vmax,
            )
    # plot
    fig, ax, cnorm, cmap, cb, scalarMap = plotman.plot_elements_to_ax(
            cid=cid,
            ax=ax,
            xmin=xmin,
            xmax=xmax,
            zmin=zmin,
            zmax=zmax,
            cblabel=cblabel,
            cbnrticks=cbtiks,
            title=title,
            zlabel=zlabel,
            xlabel=xlabel,
            plot_colorbar=True,
            cmap_name=cm,
            no_elecs=elecs,
            cbmin=vmin,
            cbmax=vmax,
            )
    return fig, ax, cnorm, cmap, cb