Fluctuations of the spatial number density of galaxy catalog entries relative to its background rms, f_arti, for the KiDS_DR4.0_185.0_-0.5 (top left) and KiDS_DR4.0_218.6_2.5 (bottom left) tiles, which are the best and worst tiles listed in Table 1, respectively. The values are shown using a logarithmic scale, shown below the panels. Pixels with f_arti > 10 are used to create additional masks to identify image artifacts, as displayed in the corresponding right panels. The displayed areas are 1.4 deg on each side. The white square box enclosing most of the area marks the boundary of the survey tile, while the other white contours indicate examples of the handmade polygons enclosing the largest artifacts.

Table 1.

List of tiles where the cosmetic artifacts cover an area larger than 5 arcmin². Tile ID identifies the tile name, whereas A_arti is the area covered by artifacts in square arcminutes.