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. 2016 Apr 20;6:24503. doi: 10.1038/srep24503

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(a) Distribution of value of I₁₃₅₈/I₁₃₇₂ for both groups. (b) Distribution of value of I₁₆₀₆/I₁₆₃₈ for both groups. The light red histogram represented Group 1while the grey histogram represented Group 2. The dark red part is the overlap of both groups. The SERS spectra number brought into statistics of Group 1 is n = 138, and that of Group 2 is n = 156.