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Table A.1

Optical depths of the HCN (1–0) and HCO+ (1–0) lines.

Region Molecule AV< 8 8 ≤ AV< 12 12 ≤ AV< 16 16 ≤ AV

Aquial/W40 HCN(1–0) 35 »1SA
HCO+(1–0) 159 »1SA »1SA

Aquila/Serp S HCN(1–0) 17 103
HCO+(1–0) 17 67 102 »1SA

Aquila/cold HCN(1–0) 16 135
HCO+(1–0) 51 124 »1SA

Oph/main (L1688) HCN(1–0) 14
HCO+(1–0) 80 »1SA

Oph/cold HCN(1–0)
HCO+(1–0) 128 »1SA

Orion B/NGC2023 HCN(1–0) 112 12
HCO+(1–0) 10 8 18

Orion B/NGC2024 HCN(1–0) 6
HCO+(1–0) 7 10 14

Orion B/NGC2068 HCN(1–0) 8
HCO+(1–0) 11 16 20

Orion B/NGC2071 HCN(1–0) 24
HCO+(1–0) 21 29 »1SA

Notes.

(†)

The spectra in Fig. A.9 are used to derive the intensities.

(‡)

The emission of the rare species is not detected.

(SA)

The intensity of the normal species is weaker than that of the rare species due to the self-absorption effect.

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