it is clear that the resonance is observable, and corresponds very closely in energy and weight to experiment.[@hudson] It appears, however, only in the case where the order parameter has been suppressed \[Fig. \[fig2\](a,b)\] over a patch, thus creating the sharp coherence peaks which are then separated from the impurity feature. At this point, the role of the suppressed hopping is purely phenomenological, but we note that such a reduction was also assumed in the more complicated set of potential parameters taken by Tang and Flatté[@tangflatte] to describe the Ni resonance. The particular values of $\delta t$ and $\delta \Delta$ necessary for the LDOS near the Ni impurity to resemble the experimental data are bandstructure-dependent.

From the point of view of experiment, scanning at a bias voltage corresponding to the resonant frequency $\omega=\pm \Omega_0$ of the Ni resonance should produce spatial patterns as shown in Fig. \[fig3\]. In the left column of panels, we show the LDOS at resonance without suppressed hopping; impurity states are hardly observable, even in the reduced gap case. When the hopping around the impurity site is reduced, the pattern is clearly seen in the suppressed gap case but not in the large gap case. Note 