Fig. 2

Non-normalized probability density of the emergent white light intensity extracted from 14 snapshots of the 3D model. “all” labels the overall distribution, “up” and “down” are the distributions restricted to up- or down-flowing material only. Intensities are given as relative deviation from the (temporal and spatial) mean intensity. As velocity criterion the sign of the vertical velocity component at log τross = 0 was taken.
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