Table 4: Main physical parameters of our sources found in literature: dust temperature ($T_{\rm d}$), H2 column and volume densities ( $N_{\rm H_2}$ and $n_{\rm H_2}$, respectively) and gas kinetic temperature ( $T_{\rm kin}$). The references are shown between brackets.
Source $T_{\rm d}$ $N_{\rm H_2}$ $n_{\rm H_2}$ $T_{\rm kin}$
  (K) ( $\times 10^{22}$ cm-2) ( $\times 10^{5}$ cm-3) (K)
05345+3157 - 8.6 (1) 1.5 (1) 17.0 (2)
05373+2349 27(1) 5.9 (1) 2.4 (1) 21.2 (3)
18144+3157 29(1) 17.7 (1) 1.8 (1) 23.6 (3)
18511+0146 35 (1) 6.2 (1) 0.4 (1) 27.3 (4)
18517+0437 38 (5) 68 (6) 5.4 (6) 29 (3)
19092+0841 29 (1) 12.4 (1) 1.6 (1) 40.4 (4)
20126+4104 62 (5) 52 (6) 11.4 (6) 23.0 (5)
20216+4107 46 (5) 18 (6) 3.1 (6) 21.0 (5)
20343+4129 44 (5) 22 (6) 3.9 (6) 18 (5)
22172+5549 30 (1) 4.8 (1) 0.8 (1) 17.5 (3)
(1) Molinari et al. (2000);
(2) Jijina et al. (1999);
(3) Molinari et al. (1996);
(4) Brand et al. (2001);
(5) Sridharan et al. (2002);
(6) Beuther et al. (2002).

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