Convergence of the iterative data reduction for artificial, circular, Gaussian sources with a peak flux density larger than 150 mJy beam^-1. The first and second columns show the ratio of the output to the input peak flux densities, and its relative variations, respectively. The third and fourth columns show the same for the total flux. The different rows show sources of different widths, as specified in each panel of the first column. The size of the symbols increases with the input peak flux density.