Cut-out of M 31 image (from DSS2-R) overlaid with positions of bulge (white) and disk novae (black), where the large ellipse separates both populations (see Sect. 5.3). Circles mark novae with high-mass (blue) and low-mass (red) WDs, which were classified according to their SSS t_on times. See Sect. 5.3 for the classification methods. Only four objects from Table 9 are outside this image. North is up and east is to the left.