SED fitting of the companion, combining the Gaia G, and SPHERE H2 and H3 photometric bands using BT-Settl atmospheric models. The filled squares are the measured photometric data with error bars, and the open squares are the modelled photometric data. The grey lines are 30 spectra randomly drawn from the posterior distributions. The upper panel shows the transmission of photometric bands, and the lower panel shows the residuals in σ.