Notes. (1) See Fig. 6 for the locations of points A−D and the locations of the brightness extrema. (2) The Diff. (kpc) values are calculated as the difference between the measurements from each extrema to each apside. This is effectively a quantitative representation of the symmetry of each extrema within each disk. As denoted in Table 5, the difference between the apside measurements of the outer disk is minimized when measured in relation to the brightness maximum (nucleated bulge). This means that the bulge lies at the center of the outer disk. Alternatively, the difference between the inner disk apside measurements is minimized when measured in relation to the brightness minimum. Thus, the minimum is the center of the inner disk.