Open Access
Fig. E.1

Velocity maps derived from N2H+ for B1-c and SSMM18, N2D+ for B1-b and BHR7. Data are presented in Huang & Hirano (2013), Matthews et al. (2008) and Tobin et al. (2018) for B1-b, B1-c and BHR7 respectively. The Serpens South MM18 data come from the PdBI CALYPSO survey.
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