Left: observed SED of J1832. Black dots refer to the minimum fluxes in the eclipse and represent our best estimate of the SED of the secondary star. Green and yellow squares indicate the SED outside eclipse measured simultaneously with the MuSCAT3 photometer and the FTN on 9 May and 15 April 2021, respectively. Colored dots indicate nonsimultaneous out-of-eclipse fluxes (see text). Center: de-reddened SED based on the best-fit E_B − V  =  0.54. Right:Δχ² vs. E_B − V (plus signs, left scale) and the associated (r − i)_P1 (green dots, right scale).