Ratio of the brightness temperature to the maximum irradiation temperature (at the substellar point – see text) versus wavelengths for exoplanets with detected visible and infrared secondary eclipses. Green and red curves correspond to the total modeled spectrum and to the thermal emission alone, respectively. The ellipses account both for the bandpasses of the observations (horizontally) and the uncertainties of the measurements (vertically). The colors indicate whether the data come from space telescopes (blue), midlatitude ground based facilities (orange), or ASTEP 400 (red).