Semi-log plot of the temperature profile of Betelgeuse’s extended atmosphere. The red filled circles and blue filled diamonds represent the gas temperature derived from multi-epoch spatially resolved radio observations (Lim et al. 1998; O’Gorman et al. 2015a). The large black dashed rectangle is the approximate location and temperature range of the MOLsphere. The black filled square is our ALMA band 7 temperature which shows that the mean gas temperature has dropped well below the effective temperature at ~1.3 R_⋆.