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. 2022 Jan 4;414(4):1481–1492. doi: 10.1007/s00216-021-03800-y

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Fig. 2 — Difference spectra calculated by subtracting the mean spectrum of sensitive strains from the mean spectrum of resistant ones. A Spectrum derived from UVRR spectroscopy. B Spectrum derived from Raman microspectroscopy. The spectra are normalized and are presented in the same scale