Example of the weeding process for the 47 Tuc catalog. Top: magnitude offset versus radial offset for sources found around bright stars. We plotted the spurious objects that have been rejected in red. Middle: Y vs. X separation of the rejected (left) and accepted (right) detections from the corresponding bright stars. Bottom: on the left, we show all the objects (red circles) in a ~100 × 100 pixels region in the 47 Tuc catalog, and on the right, we highlight the detections that have been accepted (green circles). As described in the text, a faint star near the bright one pointed by the red arrow on the bottom has been flagged even if it was not an artefact.