Fig. 2
CH λ149 μm spectra (left panel, the reference frequency for the velocity scale givenby the second HFC) and deduced column density profiles (right panel) for (from top to bottom): W49 N, W51 e2, W3(OH), W3 IRS5. The blue markers in the W3(OH) spectrum show the hyperfine splitting and weights). The median column densities are indicated by the red lines. The dark-gray-shadowed profiles indicate the (−σ− , +σ+) limits, that is, 84.13% confidence, assuming a 5% error in the continuum level.
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