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2DSPR spectra of (a) tyrosine, (b) tryptophan, (c) 1:1 mixture and (d) WY dipeptide. The spectra of mixture are obtained by summing the contributions from tyrosine and tryptophan. Vertical slices of the mixture and dipeptide spectra show a shift between Raman profile peaks of (c, black) and (d, blue). Dashed lines denote the tilted directions. A nonlinear scale function [Eq. 13] is used for better visibility.
