Fig. 3
Left: visual representation of the H2O ortho-to-para ratios, separated into H217O (open triangles) and H218O (filled triangles) isotopologues and colour-coded by source (see lower legend). The dotted line indicates the expected ortho-to-para ratio of 3 (see text for more details). Right: same data as shown in the left panel, with the addition of H216O data taken from Maercker et al. (2016) and Khouri et al. (2014b).
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