Testing data shown with the scaling power of  −1.5. From left to right in the first row are: a) the test image of size 256 × 256, b) the zero-padded true-sky image of size 2048 × 2048, c) the uniform-weighted UV coverage of ASKAP, d) natural-weighted UV coverage of ASKAP. From left to right in the second row are: e) the corresponding PSF of the uniform-weighted UV coverage in a three-times-enlarged version, f) the corresponding PSF of natural-weighted UV coverage in a three-times-enlarged version, g) the dirtymap with the uniform-weighted UV coverage, and h) the dirtymap with the natural-weighted UV coverage.