Table 2: Column densities and abundances relative to H2 (boldface) inferred at positions of interest in the Horsehead, IC 63 and L1688-W. (d) 1012 cm-2. Units for column densities are in cm-2 and indicated in superscript for each molecule. Units for abundances are indicated in the first column of each corresponding row. The offsets refer to the positions indicated Figs. 6 and 9.
Molecule Horsehead nebula IC 63 cut L1688-W cut
  CO peak IR peak Hydroc. peak (0 $^{\prime \prime }$, 0 $^{\prime \prime }$) (10 $^{\prime \prime }$, -10 $^{\prime \prime }$) (20 $^{\prime \prime }$, -20 $^{\prime \prime }$) ( $\Delta \alpha=-21$ $^{\prime \prime }$) ( $\Delta \alpha=-134$ $^{\prime \prime }$)
H2  $^{\rm (10^{21})}$ $7.5\pm 2.5$ $7.2\pm 2.4$ $10.5\pm 3.5$ $5.0 \pm 2.0$ $5.0 \pm 2.0$ $5.0 \pm 2.0$ $11.4\pm 2.4$ $2.4\pm 0.3$
C18O  $^{\rm (10^{15})}$ $5.0\pm 0.2$ $3.5\pm 0.2$ $4.0\pm 0.2$ $0.18 \pm 0.02$ $0.05\pm0.02$ $0.05\pm0.02$ $4.0\pm 0.2$ $0.4\pm0.02$
(10-7) 6.7 $\pm $  2.2 4.9 $\pm $  1.6 3.8 $\pm $  1.3 0.36 $\pm $  0.15 0.10 $\pm $  0.06 0.10 $\pm $  0.06 8.0 $\pm $  3.2 1.7 $\pm $  0.2
C2H  $^{\rm (10^{13})}$ $17.0\pm 2.0$ $16.0\pm 2.0$ $22.7\pm 3.3$ $5.3\pm0.4$ $8.6\pm0.6$ $6.9\pm0.5$ $3.0\pm 0.3$ $2.0\pm 0.2$
(10-8) 2.3 $\pm $  0.8 2.2 $\pm $  0.8 2.2 $\pm $  0.8 1.1 $\pm $  0.4 2.1 $\pm $  1.0 1.4 $\pm $  0.6 0.6 $\pm $  0.2 0.8 $\pm $  0.1
c-C3H  $^{\rm (10^{12})}$ <2.1 $3.9 \pm 0.5 $ - <1.2 - - - -
(10-10) <2.8 5.4 $\pm $  1.9 - <2.4 - - - -
l-C3H  $^{\rm (10^{12})}$ <2.3 $2.1 \pm 0.7$ - <5.8 - - - -
(10-10) <3.1 2.9 $\pm $  1.4 - <11.6 - - - -
c-C3H2  $^{\rm (10^{12})}$ $11.0\pm 3.0$ $9.3 \pm 0.2$ $15.0 \pm 5.0$ $4.5\pm 1.0$ $4.7\pm 1.0$ $3.0\pm0.6$ $3.0\pm0.6$ $3.0\pm0.6$
(10-9) 1.5 $\pm $  0.6 1.3 $\pm $  4.3 1.4 $\pm $  0.7 0.9 $\pm $  0.4 0.9 $\pm $  0.4 0.6 $\pm $  0.3 0.6 $\pm $  0.3 1.3 $\pm $  0.3
l-C3H2  $^{\rm (10^{12})}$ <0.32 <0.33 - - - - - -
(10-11) <4.3 <4.6 - - - - - -
CH3C2H  $^{\rm (10^{13})}$ <1.1 <1.1 - - - - - -
(10-9) <1.4 <1.4 - - - - - -
C4H  $^{\rm (10^{12})}$ $10.0\pm 3.0$ $11.0\pm 3.0$ $31.0\pm 7.0$ $3.3\pm0.2$ $3.7\pm0.4$ $6.5\pm1.5$ $15.0\pm 3.0$ -
(10-9) 1.3 $\pm $  0.6 1.5 $\pm $  0.7 3.0 $\pm $  1.2 0.6 $\pm $  0.3 0.7 $\pm $  0.3 1.3 $\pm $  0.6 3.0 $\pm $  1.3 -
C6H  $^{\rm (10^{12})}$ - - $1.0 \pm 0.5$ - - - - -
(10-10) - - 1.0 $\pm $ 0.6 - - - - -
HN13C  $^{\rm (10^{12})}$ $1.2 \pm0.2$ $0.3 \pm0.1$ - <0.11 - - - -
(10-10) 1.6 $\pm $  0.6 0.4 $\pm $  0.2 - <0.2 - - - -
HC3N  $^{\rm (10^{12})}$ - - $0.6 \pm 0.2$ - - - - -
(10-11) - - 5.7 $\pm $ 2.7 - - - - -
CS  $^{\rm (10^{13})}$ $12\pm2$ $2.9 \pm0.5$ - $0.6\pm0.1$ $0.4\pm0.1$ $0.15\pm0.03$ - -
(10-8) 1.6 $\pm $  0.6 4.0 $\pm $  1.5 - 0.12 $\pm $  0.05 0.08 $\pm $  0.04 0.03 $\pm $  0.01 - -


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