Top: magnitudes of the 4 terms of M̂is(u, v) for the case shown in Fig. 6. The |p(u, v)| term goes to 0 in the NW and SE corners, where measurement in X^True is shifted in Z^Meas. (Y^True in F^Meas.) by the r(u, v) term. Bottom: frequency dependent measurement energy ratio of [Z^Meas., F^Meas.] cumulative energy to total energy. Edge effects are induced by pixel area integration. White pixel: undefined value for piston mode.