Simultaneous SED fitting of the primary star and fainter star to the unresolved broad-band photometric measurements of Gaia, 2MASS, and WISE with SPECIES. The black solid line is the combined best-fitted spectrum of the two stars. The black dashed line is the best-fitted spectrum of the primary star and the black dotted line is the best-fitted spectrum of the fainter star. Spectra drawn from 30 random samples of each star are shown in grey lines. The top panel shows the filter trans-mission profiles and the bottom panel shows the fitting residuals.