Intensity response within the angular extent of the star (dark gray circle) for an ideal (left) and a perturbed (right) instrument using the values from Table 1, and optimistic perturbation levels of rms(δA _k ) = 0.1%, rms(δp _k ) ≈ 1.5 nm, and rms(δθ _k ) = 0.001 rad (see Section 4). Top: response at a given instance in time. Whereas the null of the ideal instrument is broad and symmetric, the perturbed instrument shows asymmetries, indicated by contours in light gray dashed lines. Bottom: rms of the response over a full rotation of the array. While the ideal response shows a substantial suppression within the extent of the stellar disk, the suppression is much smaller in the perturbed response, explaining the increase in stellar leakage.