Radius vs. gravity as a function of age and effective temperature from the BEX Hottest cond03 evolutionary models. The color scale traces the ages on a logarithmic scale, and iso-temperature curves are labeled. The estimated position in the diagram for AB Pic b is reported for (i) the evolutionary model prediction (blue) from the BEX Hottest cond03 models using the absolute magnitudes from NaCo in the J, H, and K band (Chauvin et al. 2005) and (ii) the ForMoSA predictions (green) from our adopted values for both families of atmospheric models implemented (see Sect. 4.3).