(From left to right) first panel: a depth-of-coverage map of 25 K_S HAWK-I’s images collected in Baade’s window during the run of August 3−6, 2007. The gray-scale goes linearly from 1 to 25. The green box is the patch of sky within which there are always at least five images. Second panel: resulting stack of the 25 images. The dark spot on the top-right is the signature left by the “shadow” of the probe, which pick-up the star used for the simultaneous Active Optic correction of the VLT/UT4’s primary mirror. On the bottom-left, there is the globular cluster NGC 6522. Note that neither the dark spot nor NGC 6522 are inside the region enclosed by the green box. Third panel: focuses on the green region and shows that the distribution of stars in this field is remarkably homogeneous. Fourth panel: zoom-in of a representative sub-set of the field (indicated by the 10′′ × 10′′ red box in all panels), which is able to show a better resolved image.