Stellar model atmosphere for HD 206505 A (black line). The thin gray lines are 30 samples drawn randomly from the posterior distribution (almost invisible here because the posterior is tightly constrained). The photometry and the Gaia XP spectrum included in the fit are shown in orange and green, respectively. For better readability, only every tenth data point of the Gaia XP spectrum is shown. The top panel shows the filter transmission curve for each photometric point and the bottom panel shows the residuals between the data and the best fit stellar model atmosphere.