Comparison of multifrequency resolve and MS-MF-CLEAN surface brightness reconstructions. The images are 100² pixels large, and the pixel size corresponds to roughly 0.2 arcsec. The brightness units are in Jy/px. The ridge-like structures in the difference maps simply stem from taking the absolute value, marking zero-crossings between positive and negative errors. First row left: resolve reconstruction. First row right: MS-MF CLEAN reconstruction. Second row left: absolute per-pixel difference between the signal and the resolve reconstruction Second row right: absolute per-pixel difference between the signal and the MS-MF CLEAN reconstruction.