N131: CO (1–0) excitation temperature map (T_ex; upper) and H₂ column density distribution (N_H2; lower). For T_ex, the contour levels are 9.1 and 16.5 K, and the maximum is 30.6 K. The ellipses with numbers indicate the position and size of each fragment extracted by Gaussclumps. The letters from A to I indicate the positions of nine molecular clumps. The green and blue ellipses correspond to α_vir< 1 and α_vir> 1, respectively. The units for each colour bar are in Kelvin for T_ex and 10²¹ cm^-2 for N_H2, respectively.