Best fit of the aureole light curve from SDO/HMI at +49° (morning terminator) obtained with the single-layer, isothermal model. The flux is the same than in Fig. 4, binned over ten consecutive points. Parameters are H = 16.3 km, r_cloud = 94 km and r_1/2 = 96 km. We obtain a significant flux excess in the model at f > 0.5 when the Venus limb is more distant from the solar limb, i.e., when higher altitude refractive layers are probed. See Table 2 for the model parameters.