Surface density structure in inner regions of the TW Hya model. δgas is the inner disk drop in gas surface density. The value δgas = 0.1 used here best fits the H2 observations. The red curves show the column averaged oxygen and carbon depletion factors in TW Hya. The red solid line shows a model with constant depletion. The dotted line shows the depletion profile assuming that carbon and oxygen return to the ISM values above Tgas = 150 K.
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