Fig. 12
Bottom panel: comparison of the maser photon production rates for the 44 GHz, 36 GHz, and 25 GHz (J = 6) for various densities at 200 K. For example, the solid red and blue curves in the middle panel show a power law of ξ0.4 and ξ0.7, respectively. Top panel: modelling results for the ratios of the 62−61-E maser photon production rate to that of the 44 GHz and 36 GHz lines for various densities at 200 K. It is possible to convert ξ to methanol abundance using Eq. (3).
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