regions in cuprate superconductors, is to compare the LDOS near Ni and Zn in these two different environments. Experimentally, it is found that the Ni resonances, which are clearly distinguishable in the small-gap regions, are completely absent in large-gap regions with $\Delta
\gtrsim 50 \mbox{meV}$ for optimally doped BSCCO.[@lang] The strength of the resonances which [*are*]{} observed does not depend strongly on local gap size, but despite considerable noise appears to anticorrelate slightly with the gap.[@hoffmanthesis] It was speculated[@lang] that the absence of Ni resonances in large-gap regions is due to the distinct nature of the (pseudogap) phase characterizing these domains. However, phase coherence is not necessary for the creation of impurity resonances; the existence of the pseudogap in the density of states itself should result in well defined impurity resonant states, as found in Ref. . Indeed, recent STS measurements on native defects in underdoped single-layer [[Bi$_2$Sr$_2$CuO$_6$ ]{}]{}samples have shown that the resonances exist well above the superconducting critical temperature $T_c$ into the pseudogap state.[@chatterjee]

The LDOS near Zn is characterized by a sharp low-energy resonance around $-2 \mbox{meV}$ in the small-gap regions of optimally doped BSCCO.[@panzn] The resonance weight and width depend strongly on the local environment,[@davis; @hoffmanthesis] 