Propyne (CH3CCH) physical parameters toward IRAS 16562−3959. The left and right panels show the column density and excitation temperature, respectively. We show in each panel the location of the NW cloud, the N-red cloud, the NEC-wall, the Diffuse Ridge, the position of DR (a), (b), and (c) (black crosses), and continuum sources 8 and 10 (red crosses).