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Fig. 5


Vertically averaged H2O ice abundance (top), HDO/H2O ice column density ratio (middle), and ice column density ratio of D2O/HDO to HDO/H2O (bottom) in the forming disk as a function of radius at selected times in our fiducial model, represented by different colors (solid lines). Arrows on the right-hand margin indicate the values at the onset of collapse. The disk outer radius increases with time. The black dashed lines represent the prediction assuming in situ formation of water ice in the disk structure given at t = tacc.

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