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Images of the paper before and after column-wise intensity normalization (top) captured with a custom reflectance confocal microscope with a 15.1 kHz resonant scanner and 5° field of view, and their corresponding column-wise power spectra (bottom). Note the dark left and right edges indicating the lower Strehl ratio due to the resonant scanner mirror distortion and the attenuation of higher spatial frequencies in the same areas (arrows).
