This article has an erratum: [https://doi.org/10.1051/0004-6361/201935428e]
Same as Fig. 5 but for the column density multiplied by the solid angle of the COM emission and divided by the 3 mm continuum peak flux density. No 3 mm continuum flux density is available for L1448-NB2 and IRAS4A2 because these sources are unresolved from their close primary protostar at this wavelength.
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