Azimuthally averaged intensity profiles of HD 169142 showing the difference between the stellar PSF and the disk. Upper panels: radial profiles for the I′ band (left) and the R′ band (right) for the observed intensity I_tot(r) and the best power-law fit for the stellar PSF I_⋆(r). Bottom panels: profiles for the best fitting disk intensity model I_d(r) = γQ_ϕ(r), together with the difference I_tot(r)−I_⋆(r) and the fit residuals (dashed lines). The MCMC fit optimization range is between 30 px (0.108″) and 70 px (0.252″), as indicated by the vertical lines.