This article has an erratum: [https://doi.org/10.1051/0004-6361/201528001e]
Comparison of the H2CO (left) and CH3OH (right) abundances, n(x)/nH, from Models 4, 5, and 6 with observations from the Horsehead PDR. The range of observational abundances for each molecule is shown with magenta lines.
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