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(a) Microscopic image of section of lily's outer scales, Raman spectra were collected along the red line with a length of 150 μm; (b) a waterfall plot for Raman spectra on the line, in which the color has nothing to do with the color of the points; (c)Raman spectra of 8 points. The red arrows in each figure indicate the direction from the epidermis to the matrix.
