Top panels: uniform disk diameter derived from each individual VEGA V² measurements (continuum band in the left and Hα band in the right) plotted as a function of the baseline position angle (PA). The red dotted line represents the best-fit diameter from modeling all the data in each band (θ = 0.28 mas in the continuum and θ = 0.36 mas in the Hα band). Bottom panels: corresponding normalized residuals.