Surface density histograms versus magnitude. Panels a) to c): as in Fig. 4, but magnitude is used instead of color. The vertical dotted line shows the position of the TOM. The ~0.2 mag tolerance for the peak position (gray shaded area) is also shown as well as the best-fit Gaussian to the GCLF (green line; mag, σ_TOM = 1.14). Panel d): edge and second-run edge (Edge2) functions.