Fig. 1
NH2 OPR computed as a function of temperature at thermal equilibrium in black along with the observed OPR values from Persson et al. (2016) in blue, cyan and pink at the lowest values of the observed temperature ranges (Persson et al. 2016). For the sake of clarity the uncertainties of the observed temperatures are omitted. The NH2-OPR statistical value of 3 is represented by the dashed red line.
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