Offset map profiles shown in panel a for the colored rows indicated in panel b. Map of detected offsets in panel b. Color indicates the amount of shifting needed in units of pixels for each pixel along the x-axis to remove the smile distortion. Panel c shows a map of the pixel-wise error 𝓔(p_min, x), and panel d the result of the error function as of Eq. (1) for the selected polynomials.