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Fig. 1


Star volume density (left) and mean stellar age (right) as a function of time during the gravitational collapse of a stellar sphere of unit radius. The elapsed time is indicated in the left panel. Star formation is turned off for this test problem. The dash-dot-dotted lines shows the mean stellar age when calculated using the Eulerian form to account for bulk motions of stars instead of the Lagrangian form (see text for more detail).

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