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One set of recta with (a) malignant tissue and (b) normal. (a) and (b) OCT images, (a′) and (b′) pathological images. The curving fitting of image (a) and (b) were shown in (a″) and (b″). The arrows in (a), (b), (a′) and (b′) indicate the similar locations in pathological and OCT images.