The third condition to determine 51 is provided by the coordinates of the maximum amplitude. The results from Shack-Hartmann tests show that the slope at the origin is of the form
where a1 and a3 are coefficients. This allows one to construct a hysteresis grid model from the locus of the maximums, i.e. the coordinates of antinode A points. Therefore, the hysteresis amplitude grid for any sequence up to qseq is defined by
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