Surface temperature distribution computed with CoMBiSpeC for the stars of the BD+60° 497 binary system at the phases corresponding to the spectra in Fig. 2. The stars are displayed as they would be seen from Earth, assuming an orbital inclination of 45°. The top left (respectively top right) panel stands for the configuration corresponding to the 2002-2003 (respectively 2018-2022) epoch spectrum in the top row of Fig. 2. The bottom left and bottom right panels likewise correspond to the two epochs in the bottom row of Fig. 2.