Fig. 8
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Column densities of gaseous H2CO as a function of time for slow C-shock (10−20 km/s) and high C-shock (50 km/s) models with a pre-shocked gas density volume of nH2 (init) = 105 cm−3 and ζ=ζ0. The dashed and solid lines correspond to the default and current schemes, respectively. The hatches represent the range in the H2CO column density reported by Gómez-Ruiz et al. (2016) for IRAS4A-R and IRAS4A-B.
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