Modelling the continuum emission of our sources. SPT0103−45 is in the first row, SPT2147−50 in the second row and SPT2357−51 in the third row. For every source, the first panel (from the left) is the dirty image of the continuum, the second is the dirty image produced by best-fit model, third is a ‘high-resolution’ image-plane model, i.e. not sampled by the uv coverage of the data and the fourth panel is the best-fit model in the source plane. In the third and fourth panels, the lensing caustics are shown in white.