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Fig. 4.


Schematic of the TW Hya disk showing the locations that should trap the oxygen- and carbon-bearing molecules. Oxygen needs to be trapped outside of 2.4 AU and is most likely trapped in the dust ring at that location. Carbon can either be trapped at the same location, with CO2 being the most probable carrier, or at larger radii outside the CO ice line, with CO being the most probable carrier.

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