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Nominal 1089 cm−1 peak Raman spectra characteristics. Unsmoothed full width half maximum (FWHM, double-headed arrow) and frequencies (above peak) of the ca. 1089 cm−1 peak in control (a), low, stable pH (b) and low, abrupt pH (c) treatments (n = 3 ± SD). Grey band indicates FWHM of the control treatments for comparison.
