Fig. 4
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Comparison of the HCN, HC3N, HC5N, and HC7N rate coefficients induced by collisions with He for a kinetic temperature of 10 K. Each panel shows downward transitions out of the indicated rotational level. The data for HCN were computed by Dumouchel et al. (2010). All data shown in this plot were calculated using the close-coupling quantum mechanical approach.
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