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A detailed comparison is made between the topological structure of quenchedQCD as revealed by the recently proposed over-improved stout-link smearing inconjunction with an improved gluonic definition of the topological density onone hand and a similar analysis made possible by the overlap-fermionictopological charge density both with and without variable ultraviolet cutoff$\lambda_{cut}$. The matching is twofold, provided by fitting thedensity-density two-point functions on one hand and by a point-by-point fittingof the topological densities according to the two methods. We point out thesimilar cluster structure of the topological density for moderate smearing and$200 \mathrm{MeV} < \lambda_{cut} < 600 \mathrm{MeV}$, respectively. Wedemonstrate the relation of the gluonic topological density for extensivesmearing to the location of the overlap zero modes and the lowest overlapnon-zero mode as found for the unsmeared configurations.

Vacuum structure revealed by over-improved stout-link smearing compared with the overlap analysis for quenched QCD