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Table 3

Fractional abudances and abundance ratios.

E1 E2 W2 W1

N(C18O) (×1016) 10 4.1 4.8 11
X(CN) (×10-9) 1.4 3.2 4.0 1.2
X(N2H+) (×10-11) 2.4 3.1 4.4 2.0
X(CS) (×10-10) 5.2 7.2 7.8 4.3
X(H13CO+) (×10-11) 1.8 1.3 2.4 1.3
X(o-C3H2) (×10-10) 2.0 2.8 3.4 2.4
X(p-H2CO) (×10-11) 7.4 >9.6* >5.6* 4.6
X(HC3N) (×10-11) 8.1 <13* <31* 5.3
X(CH3CN) (×10-11) 1.4 <1.0** <0.8** 1.0
[ CN ] / [ N2H+ ] 56 101 92 58
[ CN ] / [ CS ] 2.8 4.7 5.6 2.9
[ CS ] / [ N2H+ ] 20 17 23 21
[ H13CO+ ] / [ N2H+ ] 0.7 0.5 0.5 0.6

Notes. Beam (5.9) average column densities resulting from LVG calculations in a grid with Tk = 50–150 K, and n(H2) = 1 × 105, 5 × 105. Errors correspond to the lowest and highest values in the grid.

(*)

Reasonable guess since HC3N and H2CO are blended at this position.

(**)

Upper limits have been derived assuming Δv = 50 km s-1, Tk = 50 K and n(H2) = 5 × 105 cm-3.

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