def plot_lc_phasezoom(ax, phi, flux, phase, phaseflux, phaseflux_err,
    phase_grid, model_phaseflux_grid, zoomfactor):
    """
    zoomfactor : period * 24 * 60
    """
    ax.plot(phi * zoomfactor, flux, 'k.', color='lightgrey', rasterized=
        True, zorder=10)
    ax.errorbar(phase * zoomfactor, phaseflux, yerr=phaseflux_err, fmt='b.',
        zorder=11)
    ax.plot(phase_grid * zoomfactor, model_phaseflux_grid, 'r-', lw=2,
        zorder=12)
    ax.set(xlim=[-240, 240])
    ax.set(xlabel='Time (min.)', ylabel='Flux')
    return ax
