False colour image from the GALACTICNUCLEUS survey (using JHK_s bands) showing the regions used in this study. The red arrow marks the position of the supermassive black hole, Sagittarius A* (Sgr A*). The names of the regions are also indicated in the figure: central, transition east (TE), transition west (TW), inner bulge south (IBS), and inner bulge north (IBN). The distances between the regions correspond to real distances, as indicated by the scaling arrows.