Fig. 11
Gas-phase steady-state models based on the reaction network by Roueff et al. (2007). Shown are the D/H predicted ratios; HDCO/H2CO (top), D2CO/HDCO (middle), and N2D + /N2H + (bottom) as function of temperature and for two different H2 densities (5 × 105 cm-3 and 1 × 106 cm-3). The coloured boxes correspond to the observed ratios for the three cores as indicated in the top panel. The size of the rectangles represents the estimated uncertainties.
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