Table 6: Formaldehyde abundances as derived from the envelope model in the outer parts of the envelope ( $X_{\rm out}$) and the inner parts of the envelope ( $X_{\rm in}$). The table also includes the radius where the dust temperature is 100 K and 50 K, and the density at the radius where the dust temperature is 100 K.
Source $R_{\rm 100~\rm K}$ $R_{\rm 50~\rm K}$ $n_{\rm 100~ \rm K}$ $X_{\rm out}$ $X_{\rm in}$
  (AU) (AU) (cm-3)    
NGC 1333-IRAS 4A 53 127 2 $\times$ 109 2 $\times$ 10-10 2 $\times$ 10-8
NGC 1333-IRAS 4B 27 101 2 $\times$ 108 5 $\times$ 10-10 3 $\times$ 10-6
NGC 1333-IRAS2 47 153 3 $\times$ 108 3 $\times$ 10-10 2 $\times$ 10-7
L1448-MM 20 89 2 $\times$ 108 7 $\times$ 10-10 6 $\times$ 10-7
L1448-N 20 95 1 $\times$ 108 3 $\times$ 10-10 1 $\times$ 10-6
L1157-MM 40 105 8 $\times$ 108 8 $\times$ 10-11 1 $\times$ 10-8
L1527 20 140 3 $\times$ 106 3 $\times$ 10-10 6 $\times$ 10-6
VLA1623 13 48 2 $\times$ 108 8 $\times$ 10-10 -
IRAS16293-2422a 133 266 1 $\times$ 108 1 $\times$ 10-9 1 $\times$ 10-7


a From Ceccarelli et al. (2000c).


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