Mothra’s SED and the best matching binary model. The blue and red lines represent model stellar spectra for stars with T_eff and μL_bol as shown in the legend. Models are from the Lejeune et al. (1997) compilation of stellar atmosphere spectra at solar metallicity redshifted to z = 2.091. The green line shows the combined SED. Black circles with error bars represent the observed photometric data and green boxes the model photometry resulting from the best-fit compound spectrum. If the two stars experience the same magnification, the high–T_eff star has a bolometric luminosity ≈0.4 dex (a factor of ≈2.5) higher than that of the low–T_eff star.