def METHOD_NAME(plot_fig, reason, color='r'):
    ax = plot_fig.axes[0]
    xlims = ax.get_xlim()
    ylims = ax.get_ylim()
    xmid = 10**(0.5*(log10(xlims[0]) + log10(xlims[1])))
    ymid = 10**(0.5*(log10(ylims[0]) + log10(ylims[1])))
    ax.text(xmid, ymid, reason, ha='center', va='center', bbox=dict(fc='white'))
    color = 'r'
    ax.plot(xlims, ylims, lw=5, c=color)
    ax.plot(xlims, ylims[::-1], lw=5, c=color)