Sample of the interpolated maps of the peak intensity of the HO line, which is a proxy (when saturated) for the gas temperature (−10 K because of the difference between the blackbody temperature and the Rayleigh-Jeans approximation used for the T_mb scale). The 20 June 2016 map shown here was not used because the HO line is no longer saturated at the local gas temperature: Tp(HO) decreases out to ≈0 K because of the low column density.