Spectral energy distribution (SED) of CHS 7797 during maximum (circles) and minimum (open squares) brightness. Open triangles show IRAC measurements at 5.6 μm and 8 μm, which are single-epoch observations taken about 3 − 4 days after maximum. The best-fitted model found by VOSA, i.e. NextGen models with T_eff    =    2700 K and log    g    =    4, is shown. Note that brightness difference between minimum and maximum decreases for λ ≳ 2   μm.