Table 3: Physical properties of observed IRDCs.
Source Offsets $T_{\rm EX}$ $T_{\rm ROT}$ $T_{\rm KIN}$ $N({\rm NH_3})$ $N({\rm H+H_2})$ $\chi_{\rm NH_3}$
  [arcsecs] [K] [K] [K] [ $10^{14}~{\rm cm^-2}$] [ $10^{22}~{\rm cm^-2}$] [10-8]
G11.11-0.12 ${\rm NH_3}$ P1 (80,40) 7.6 ($\pm$0.7) 12.3 ($\pm$1.2) 12.7 41.5 ($\pm$ 6.4) 8.4 4.9
G11.11-0.12 ${\rm NH_3}$ P2 (0,0) 6.6 ($\pm$0.4) 13.4 ($\pm$1.0) 13.8 30.5 ($\pm$ 3.3) 10.2 2.9
G11.11-0.12 ${\rm NH_3}$ P3 (-300,-325) 7.1 ($\pm$0.3) 14.1 ($\pm$9.7) 14.5 60.4 ($\pm$ 11.4) 8.7 6.9
G11.11-0.12 ${\rm NH_3}$ P4 (-300,-400) 5.7 ($\pm$0.5) 10.5 ($\pm$1.0) 10.8 50.9 ($\pm$ 10.6) 16.1 3.2
G19.30+0.07 ${\rm NH_3}$ P1n (20,20) 8.2 ($\pm$0.9) 17.6 ($\pm$2.0) 18.4 25.9 ($\pm$ 3.2)    
G19.30+0.07 ${\rm NH_3}$ P2 n (-60,-20) 5.9 ($\pm$0.7) 13.8 ($\pm$1.8) 14.3 33.3 ($\pm$ 6.9)    
G24.72-0.17 ${\rm NH_3}$ P1 n (150,220) 6.6 ($\pm$0.6) 17.4 ($\pm$2.2) 18.2 44.3 ($\pm$ 5.7)    
G24.63+0.15n (0,0) 5.0 ($\pm$0.5) 14.3 ($\pm$1.4) 14.8 24.1 ($\pm$ 4.4)    
G28.34+0.06 ${\rm NH_3}$ P1 (0,0) 5.7 ($\pm$0.2) 16.0 ($\pm$1.2) 16.6 32.1 ($\pm$ 2.2) 5.8 5.5
G28.34+0.06 ${\rm NH_3}$ P2 (20,200) 5.5 ($\pm$0.2) 15.4 ($\pm$1.4) 16.0 38.6 ($\pm$ 3.2) 32.7 1.2
G28.34+0.06 ${\rm NH_3}$ P3 (-60,-60) 4.8 ($\pm$0.2) 12.8 ($\pm$1.2) 13.2 47.2 ($\pm$ 6.1) 5.9 8
G28.34+0.06 ${\rm NH_3}$ P4 (-30,50) 4.8 ($\pm$0.2) 15.9 ($\pm$2.2) 16.4 37.4 ($\pm$ 4.9) 3.7 10.1
G28.34+0.06 ${\rm NH_3}$ P5 (50,40) 5.6 ($\pm$0.3) 13.6 ($\pm$1.3) 14.1 29.6 ($\pm$ 3.8) 6.3 4.7
G33.71-0.01 ${\rm NH_3}$ P1 n (-40,-200) 5.6 ($\pm$1.1) 16.6 ($\pm$2.3) 17.2 23.0 ($\pm$ 6.6)    
G33.71-0.01 ${\rm NH_3}$ P2 n (60,100) 5.3 ($\pm$0.3) 17.1 ($\pm$2.0) 17.8 29.0 ($\pm$ 3.3)    
G79.27+0.38 ${\rm NH_3}$ P1 (-20,0) 4.8 ($\pm$0.2) 12.4 ($\pm$0.9) 12.8 20.5 ($\pm$ 2.5) 14.2 1.4
G79.27+0.38 ${\rm NH_3}$ P2 (-140,40) 6.0 ($\pm$0.7) 11.2 ($\pm$1.4) 11.5 11.3 ($\pm$ 2.7) 12.1 0.9
G79.27+0.38 ${\rm NH_3}$ P3 (-250,70) 3.3 ($\pm$2.2) 11.7 ($\pm$1.6) 12.0 10.0 ($\pm$ 25.0) 6.5 1.5
G79.34+0.33 ${\rm NH_3}$ P1 (0,0) 5.8 ($\pm$0.3) 14.1 ($\pm$0.8) 14.6 11.9 ($\pm$ 1.0) 17.5 0.7
G81.50+0.14 n (260,-375) 5.6 ($\pm$1) 14.9 ($\pm$1.3) 15.4 7.6 ($\pm$ 2.0)    
Notes: Columns are name, offset position from reference, excitation temperature, ${\rm NH_3}$ rotational temperature, kinetic temperature, ${\rm NH_3}$ column density, $\rm H_2$ column density, ${\rm NH_3}$ abundance, gas mass estimated from SCUBA data, size of the cores, virial masses from ${\rm NH_3}$  the alpha parameter defined as in total cloud mass from ${\rm NH_3}$. The formal errors are given in brackets. n are those sources for which the sizes have been derived from ${\rm NH_3}$ data. The $\rm H_2$ column densities are estimated from 850 ${\mu }$m SCUBA map (Carey et al. 2000).


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