Top: spectral energy distribution (SED) fit of YSES 1 b using MagAO-X, SPHERE, and NACO data using only an atmospheric model. The black line shows the best-fit model (${\chi }_{\nu }^2$ = 3.37). The grey lines show 30 random samples drawn from the posterior distribution. The filled markers show the original data points, while the white markers show the synthetic photometry derived from the best-fit model. Bottom: deviation between data and synthetic photometry in units of the standard deviation.