Comparison of best-fitting synthetic and observed photometry: the top panel shows the spectral energy distribution. The colored data points are fluxes converted from observed magnitudes, while the gray solid line represents the best-fitting single-star model. The three black data points labeled “box” are fluxes converted from artificial magnitudes computed by means of box filters of the indicated width from a high-dispersion IUE spectrum (magenta line). The four lime green ultraviolet data points are flux measurements from the TD1 catalog (Thompson et al. 1978) and are shown here for a consistency check. The residual panels at the bottom/side show the differences between synthetic and observed magnitudes/colors. The photometric systems have the following color code: Johnson-Cousins (blue), Strömgren (green), Tycho (brown), Hipparcos (cyan), 2MASS (red), WISE (magenta), Geneva (crimson).