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(i) Illustration of the reproducibility of the SERS spectra of E. coli UM013 shown as three technical replicates recorded on 3 different days: (a–c) Day 1, (d–f) Day 2, and (g–i) Day 3. (ii) Comparison of the ratio of the relative intensities of the 658:732 cm–1 vibrational bands.
