H2CO and CS in diffuse clouds: Excitation and abundance

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Table 5

Ratios of integrated optical depth to the integrated optical depth of the −10 km s^-1 velocity component.

Velocity (km s^-1)	−17	−14	−10	−8	−4
o-H₂CO (150 GHz)	1/1.56	1/3.8	1/1	1/2.2	1/3.8
p-H₂CO (145 GHz)	1/1.72	1/3.8	1/1	1/2.1	1/3.8
o-H₂CO (4.8 GHz)	1/1.95	1/7.8	1/1	1/3.0	1/6.4

Notes. The intrinsic N(H₂CO) ratios should follow the mm-lines, and if the ratio τ(υ = x)/τ(υ = −10) is smaller in the 4.8 GHz line, that should indicate higher electron fraction in the υ = x component than in the − 10 km s^-1 component.

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