[CN]/[N2H+] abundance ratio as a function of the cloud size for models with CR = 5 × 10-15 s-1 and Draine fields of 6 × 103 (red line) and ×103 (blue line). Top: cloud sizes in the one-component model. Bottom: sizes of the large cloud component in the two-component model (see text). The values and errors for GP1, GP4, and SS3 are indicated.
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