Vertically averaged H2O ice abundance (top), HDO/H2O ice column density ratio (middle), and the ice column density ratio of D2O/HDO to HDO/H2O (bottom) in a disk model around a typical T Tauri star after 1 Myr evolution. The data are taken from Furuya et al. (2013) and Furuya & Aikawa (2014). In regions between the dashed vertical lines, H2O ice is abundant (~10-4) and the cometary HDO/H2O ice ratio is reproduced. The top label represents the temperature in the disk midplane.
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