and, as in the Ni case,[@lang] the resonances are never observed in the large-gap regions.[@davis; @hoffmanthesis] The temperature dependence of the Zn resonance has been measured within the superconducting state. It was found that the evolution of the peak in the range $30\mbox{mK}<T<52\mbox{K}<T_c$ is consistent with thermal broadening of the peak.[@kambara] Within the nonlocal Kondo model for Zn impurities,[@vojta] it was recently argued that a gap-dependent exchange coupling can lead to suppressed Zn resonances in large-gap regions.[@kircan] However, this model does not account for the actual spatial variation of the superconducting gap, and it is unclear how to explain the extinction of the Ni resonances. In our view, the question of what causes the extinction of the resonances and whether these effects can indeed be used as probes of pseudogap physics[@kruis; @hudson] is therefore still open.

For BSCCO materials, a significant part of the observed gap inhomogeneity has been argued to originate from interstitial oxygen dopant atoms;[@mcelroyscience] detailed theoretical modelling of the LDOS spectra[@nunner1; @nunner3] has led to the remarkable conclusion that the pairing interaction itself seems to be spatially varying in these materials on an atomic scale. This scenario in which the pairing interaction is modulated locally by nearby 