Fig. 1

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Location of the homopause, where the diffusion coefficients caused by eddy mixing and gas-kinetic motions are equal (K=Di). The colours show the hydrogen nuclei density, n〈H〉, as a function of radius r and relative height z/r. The coloured contour lines show where the homopause is situated when K is calculated with different values of log10 αmix. The dashed lines show where the vertical optical extinction AV,ver equals 100 (black), ten (dark grey) and one (light grey). The dust opacities correspond to our un-mixed model described in Sect. 3. The uneven AV contours are caused by the uneven spatial distribution of the ices, which are taken into account when calculating the opacities.
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