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Figure 7: (a) Left: a single pixel of R, G, or B is displayed at the centre of the FOV with four alignment marks in the corners; right: the single pixel R, G, or B pixel with alignment marks is captured on a CCD sensor. (b) PSF measured in the horizontal direction for R, G, and B pixels; (c) PSF measured in vertical direction for R, G, and B pixels; (d–f) direct 3D plot of the PSF for a single R, G, or B pixel, respectively.