Fig. 11
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Intensity ratios of the hyperfine components of the HCN J = 1−0 line, calculated with RADEX as a function of N(HCN). Gray areas indicate observed ranges for the F = 1−1/2−1 (top) and 0−1/2−1 (bottom) ratios, respectively 0.6, 0.6, 0.7 and 0.2, 0.2, 0.3 for clouds 21, 56, and 57. The numbers indicating the rates refer to the years of publication of the rates.
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