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Table 2

Column densities of CH.

Sources     N(CH) [cm-2]

TMC-1(CP) narrow (0.41 ± 0.05) × 1014
    broad (1.57 ± 0.12) × 1014
TMC-1(NH3)     (1.79 ± 0.42) × 1014
CI peak     (1.88 ± 0.45) × 1014
L1527 narrow (0.21 ± 0.18) × 1014
    broad (1.39 ± 0.57) × 1014

Notes. The error is evaluated from three times the standard deviation of the line parameters. Tex is assumed to be −60 K. See text.

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