Fig. 1

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Temperature variations along a radius on the equatorial plane at sunset. Two thermal conductivities κ = 0.001 and 0.01 (given in W m−1 K−1) are adopted. The depth is measured downwards from the surface. The solid and dashed lines denote the depths from which the temperature variation relative to the subsequent mesh layer is less than 0.1% for κ = 0.001 and 0.01, respectively.
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