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Fig. 15


Spatially integrated spectra of the relative transit depth (in ppm) expected for GJ 1214 b (left panel) and HD 209458 b (right panel) as a function of the day–night transition angle (β). The colour goes from red to green when β goes from 0 to 50° every 15°. The blue curve is the reference uniform case. Spectra with larger β are undistinguishable from the uniform case. The different labelled groups of curves are for our various sets of day–night temperatures. For each (TdayTnight) group, the temperature at the terminator of all the models – including the uniform one – is (Tday + Tnight)/2. Transit depth can be seen to increase monotonically when β decreases.

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