Flow chart and illustration of the process of mask creation. Images are smoothed and converted into binary masks with a threshold to identify bright extended objects. To avoid the masking of bright extragalactic objects, the masks are eroded (the pixels at the edges are set to 0), which removes small-scale objects. The masks are then dilated to recover the full size of the original masks for bright stars. Contours are created around masked areas (plotted in green) and we compare our new masks with the Coupon et al. (2018) ones (displayed as white circles and rectangles).