Fig. 4
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Comparison of the observed N(D2CO)/N(H2CO) (top panel) and N(D2CO)/N(H2CO) (bottom panel) column density ratios for our sources and for prestellar cores (Turner 2001; Bacmann et al. 2003; Chacón-Tanarro et al. 2019), low-mass protostars (Parise et al. 2006; Ceccarelli et al. 2014; Bianchi et al. 2017; Fontani et al. 2014; Manigand et al. 2020), and sources in the Orion region (Turner 1990; Parise et al. 2009).
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