Negative correlation between both the SR of the focal spot image and the contrast of the focal extended object image, and the magnitude of the single-order modal aberration. Panels a–f show the mapping curves with respect to the 3rd, 20th, 65th, 135th, 230th, and 275th modal aberrations, respectively. For each panel, all the values in the “SR” curve were normalized by dividing by their maximum SR, and similarly all the values in the “Contrast” curve were normalized by dividing by their maximum contrast.