Table 5: Results of the rotational diagram and LVG analysis.
  Rotational Diagram   LVG
Source $T_{\rm rot}$ $N_{\rm thin}$(H2CO) N(H2CO)a   $T_{\rm gas}$ n(H2) N(H2CO)b H2CO/H2c CO/H2d
  (K) (cm-2) (cm-2)   (K) (cm-3) (cm-2)    
NGC 1333-IRAS 4A 25 7 $\times$ 1013 2 $\times$ 1014   50 3 $\times$ 105 1 $\times$ 1015 5 $\times$ 10-10 8 $\times$ 10-6
NGC 1333-IRAS 4B 40 7 $\times$ 1013 2 $\times$ 1014   80 3 $\times$ 105 2 $\times$ 1014 7 $\times$ 10-10 1 $\times$ 10-5
NGC 1333-IRAS 2 24 3 $\times$ 1013 1 $\times$ 1014   70 3 $\times$ 105 5 $\times$ 1013 1 $\times$ 10-10 2 $\times$ 10-5
L1448-MM 19 2 $\times$ 1013 -   30 3 $\times$ 105 6 $\times$ 1013 4 $\times$ 10-10 4 $\times$ 10-5
L1448-N 22 5 $\times$ 1013 8 $\times$ 1013   90 1 $\times$ 105 3 $\times$ 1013 7 $\times$ 10-10 -
L1157-MM 18 1 $\times$ 1013 -   80 3 $\times$ 105 4 $\times$ 1013 3 $\times$ 10-11 6 $\times$ 10-6
L1527 16 3 $\times$ 1013 -   30 6 $\times$ 105 4 $\times$ 1013 1 $\times$ 10-9 4 $\times$ 10-5
VLA1623 11 3 $\times$ 1013 -   80 1 $\times$ 105 8 $\times$ 1013 3 $\times$ 10-10 2 $\times$ 10-4
a Corrected for opacity effects, assuming a value of $\tau = 1$ for NGC 1333-IRAS 4A, NGC 1333-IRAS 4B and NGC 1333-IRAS 2 and $\tau = 0.4$ for L1448-N respectively (see Table 4).
b Averaged over a 10'' beam.
c From H2 column densities quoted by Jørgensen et al. (2002).
d From Jørgensen et al. (2002).


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