Fig. 6
H2 column density estimated from the 850 μm dust emission map (Herczeg et al. 2017) as a function of the distance from SMM 4. A distance of 433 pc is assumed (Ortiz-León et al. 2018) in order to show the distance in astronomical units. All the sources are located in both CO and CH3 OH freeze-out zones, as indicated by the solid arrows and the grey dashed line, as taken from the DUSTY model in Kristensen et al. (2010).
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