Histograms of physical parameters derived from NH₃. (a) Intrinsic FWHM line widths of individual NH₃ (1,1) hyperfine structure components with a peak line flux threshold of 5σ; (b) peak optical depths of the main group of hf components τ_m(1, 1) for those positions with NH₃ (1,1) S∕Ns > 5σ (these line widths and peak optical depths are derived from the GILDAS built-in “NH₃ (1,1)” fitting method); (c) rotational temperature T_rot, where both the NH₃ (1,1) and (2,2) lines were detected, at levels of at least 5σ; (d) kinetic temperature T_kin, for those positions with NH₃ (2,2) line detections and >5σ features; (e) para and total (para+ortho) column densities of NH₃, for those positions exhibiting NH₃ (2,2) line detections and >5σ features, assuming an ortho- to para-ratio in thermal equilibrium at the presently obtained kinetic temperature; (f) para-NH₃ fractional abundance χ = [para-NH₃]/[H₂], and total-NH₃ (para+ortho) fractional abundance χ = [total-NH₃]/[H₂], toward the positions with NH₃ (2,2) line detections and >5σ features, again adopting ortho- to para NH₃ ratios assuming thermal equilibrium.