Fig. 2
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Methanol and C18O column density ratios computed in all positions within our sample plotted against the: visual extinctions derived from Herschel and Planck data (Palmeirim et al. 2013; Rodríguez-Baras et al. 2021) (upper panel); volume density derived from the MCMC+RADEX analysis of the methanol lines (central panel); Tdust derived fromHerschel data in Rodríguez-Baras et al. (2021) (lower panel).
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