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Table 3:

Source $T_{\rm ex}^{54}$a $N_{\rm HNCO}$b $N_{\rm HNCO}$c X(HNCO)d
  K 1013  cm-2 1013  cm-2 10-9
mm 8-11 0.2-1.3 0.2-1.3 0.3-1.2
B1 11-19 0.6-2.5 0.6-2.5 4.3-17.9
B2 9-16 1.3-5.0 1.3-5.0 25-96

Notes. (a) Excitation temperatures derived from the populations in the 50,5 and 40,4 levels. (b) HNCO column density assuming LTE, optically thin lines and extrapolating using $T_{\rm ex}^{54}$. (c) HNCO column density computed using RADEX. (d) HNCO abundance with respect to H2 (using the H2 column densities given by Bachiller & Perez Gutierrez 1997).

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