Colour maps showing the temperature distribution of our model atmospheres in a plane perpendicular to the terminator for three different transition angles between a 650 K dayside and a 300 K nightside (from left to right, the day–night transition angle is β = 15, 30, and 60°). The inner white circle represents the inner part of the planet with a radius assumed to be equal to that of GJ 1214 b (17.600 km). The star is on the left and the observer on the right on the y = 0 line. From the centre outward, the five solid lines are respectively the 106, 103, 1, 10−2, and 10−4 Pa pressure levels. Below the 103 Pa level, the atmosphere is assumed to efficiently redistribute heat and is horizontally isothermal. These maps are to scale and show that the dayside is noticeably more extended than the nightside.
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