Comparison between the observed Adelman spectrophotometric scans (colour symbols) and theoretical SED for HD 220825. The solid red line shows the theoretical energy distribution computed for the final self-consistent model atmosphere of HD 220825 with parameters T_eff = 9470 K and logg = 4.2. The dashed grey lines illustrate the effect of changing T_eff by ±100 K. The averaged spectrophotometric scan is represented by filled black circles.