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Fig. 8


Top panel: gas and total dust masses (red and black solid lines, respectively) of the clump vs. time. The red and black dashed lines show the gas and total dust mass inside the inner 2 au of the clump, respectively. Middle panel: the radial distance of the clump from the central star vs. time. Bottom panel: the gas temperature in the center of the clump vs. time. The horizontal dashed line marks a threshold temperature of 2000 K,above which molecular hydrogen dissociates. In all panels the vertical dashed lines show the time instance when the central temperature of the clump reaches the threshold value. The time is counted from t = 123.4 kyr.

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