Map illustrating the positions of spectroscopically classified stars (blue points) and early-type candidates brighter than 16 mag for the different methods, superimposed on the image from 12 June 2004. The three distinct regions, as identified in von Fellenberg et al. (2022), are delineated by circles in the images. The right hand panel shows a zoom into the central 20″, marked by the black square on the left.