Patterns resulting from the bulge-disk decomposition of our target galaxies (X-axis: galactocentric radius in kpc, Y-axis: logarithm of the central surface brightness for a face-on galaxy orientation in solar luminosities per pc²). Each panel shows the decomposition assuming a purely exponential profile for the disk. The measured surface profile is plotted using gray (blue) circles. The bulge contribution is shown with a dotted line, the disk contribution with a dashed line, and the total (bulge + disk) fit with a solid line.