Height of the exposed layer divided by the disk radius z1/r against disk radius r. Silicate grains are plotted in grey, carbon grains in black. Large grains are settled close to the midplane. In the exposed layer above z1, carbon grains can be oxidised, indicated in red. The range of vertical dust movement is shown by blue arrows. Grains stay for tres in the exposed layer, and within tmix, material from the exposed layer is well-mixed with material from the midplane.
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