Histograms of physical parameters derived from NH₃. (a) Intrinsic line widths of individual NH₃ (1,1) hyperfine structure components with hyperfine structure and a peak line flux threshold of 3σ; (b) peak optical depths of the main group of hf components τ_m (1,1) for those positions with NH₃ (1,1) hyperfine structure and S/N > 3 (these line widths and peak optical depths are derived from the GILDAS built-in “NH₃ (1,1)” fitting method); (c) excitation temperature T_ex; (d) rotational temperature T_rot; (e) kinetic temperature T_kin; (f) NH₃ column densities.