Analysis of the interferometer PSF of different ALMA array configurations. From left to right: ALMA 12 m-alone , 7 m-alone, and ALMA 12 m + 7 m. We display the PSF intensity image for each simulation (top) and an intensity profile extracted along a horizontal cut in log-scale (bottom). In the bottom panels, the colored lines show the simulated PSF profiles (see dotted yellow lines in mid-panels) obtained for the ALMA 12 m-alone (blue), 7 m-alone (red) and 12 m + 7 m (orange), while the expected Gaussian PSF profile at the correspondent resolution is marked by the shaded grey area.