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Table 4

Column densities.

Source N(N2H+) N(N2D+) N(N2D+)/N(N2H+)
(1012cm-2) (1011cm-2)
MM01 58   ±   1 4.4   ±   0.3 0.0076   ±   0.0006
MM02 56   ±   4 11.2   ±   0.5 0.020   ±   0.002
MM03† 19.5   ±   0.3 12.7   ±   0.7 0.065   ±   0.004
MM04 45   ±   6 ... ...
MM05 86   ±   14 65   ±   3 0.08   ±   0.01
MM06 41   ±   3 ... ...
MM07 31   ±   1 2.7   ±   0.4 0.009   ±   0.002
MM08 46   ±   5 2.0   ±   0.9 0.004   ±   0.002
MM09 42   ±   2 ... ...
MM10 45   ±   3 ... ...
MM11 0.9   ±   0.1 4.6   ±   0.7 0.5   ±   0.1
MM12 3.0   ±   0.1 3.2   ±   0.5 0.11   ±   0.02
MM13† 10.4   ±   0.2 ... ...
MM15 60   ±   15 ... ...

Notes.

(†)

The spectra of sources NGC 2264D-MM03 and -MM13 show two components, but since the optically thin model had to be used for at least one of the components, we used the optically thin column density estimate.

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