Left: (u, v) plane coverage of the VEGA observations of HD 24712 in the R and (red circles) and in the V band (blue circles). Right: squared visibility versus spatial frequency for HD 24712 obtained with the VEGA observations (diamonds) in the R band (red) and in the V band (blue) and best uniform-disk model provided by LITPRO for all the data points in the R band (case 1 – thick line) and for the whole data set (case 2 – thin line).