Table 3: H2 total column densities (in [1021 cm-2]) obtained from 13CO using a conversion factor of N (H2)/N ( $^{13}{\rm CO})=4.8\times 10^5$ (Dickman & Clemens 1983) and from C18O using the ratio [C18O]/[H2] = 1.7 $\times 10^{-7}$ (Frerking et al. 1982), and the calculated fractional abundances of the main isotopomers with respect to [H2] derived from [C18O].
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