Fig. 5
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R12 versus R02 from our grid of standard models. The blue curve shows the expected LTE ratios as HCN line opacities increase. The red shaded area shows very anomalous line intensity ratios (R12 < 0.6 and R02 < 0.2). Gray shadedareas show regions of the R12–R02 plane that cannot be explained by single-component static cloud models.
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