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Relative solar heat flow for to hypothesis 1 (left panel) and 2 (right panel). Lighting conditions (i.e. sunny sky at noon, sun elevation 60°), orientation and coloration of the cylindrical body are the same as in Fig. 3, top panel. A Light colour represents high thermal inflow, and a dark colour represents low thermal inflow (heat exchange in the two panels are normalized between 0 and 1, independently).
