Completeness-corrected cumulative PNLFs for the six different substructures. The cumulative PNLFs are fitted by the generalised cumulative function (in blue) for m₅₀₀₇≤ 25 mag and a function which additionally includes an exponential at the faint end (in orange; except for N Clump). The uncertainties of the fits are shaded. The region fainter than the limiting magnitude of the shallowest field (m₅₀₀₇ > 26.16 mag) is shown in grey.