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Table 4

Column densities and abundances with respect to the number of protons, i.e., [X] = 0.5 N(X)/N(H2), toward the PDR position, from single-dish observations at resolutions between 25 and 28′′.

Molecule Column density Abundance
   cm-2

H2 7.2 ± 2.4 × 1021 0.5
C2H 1.6 ± 0.2 × 1014 1.1 ± 0.4 × 10-8
c-C3H 3.9 ± 0.5 × 1012 2.7 ± 1.0 × 10-10
l-C3H 2.1 ± 0.7 × 1012 1.4 ± 0.7 × 10-10
c-C3H2 9.3 ± 0.2 × 1012 6.4 ± 2.1 × 10-10
l-C3H2 2.7 ± 0.5 × 1012 1.9 ± 1.1 × 10-10

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