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(A) Relative intensities in 1667 cm−1 Raman peaks during OTM. * Significantly different from day 0 (p < 0.05, one-way ANOVA with Turkey’s Honest Significance Difference (HSD) post-hoc procedure). (B) Normalized average GCF Raman spectra in the 1625–1715 cm−1 range during OTM. (Reprinted from Jung et al. 2014 under Open Access conditions).
