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Fig. A.1

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Column density maps of the molecules we used to calculate the deuteration fraction maps. The dashed black lines represent 90%, 50%, and 30% of the H2 column density peak value derived from Herschel maps (Spezzano et al. 2016), 2.8 × 1022 cm−2. The solid lines represent contours of the column density, starting at 3σ with steps of 3σ. From top to bottom and left to right, the average errors on the column density are 1 × 1012, 9 × 1010, 2 × 1011 and 1 × 1011 in units of cm2. The dust peak is indicated by the black triangle. The beam size of the 30 m telescope, HPBW = 31″, is shown by the red circle, and the scale bar is shown in the bottom right corners.

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