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Raman spectral data at 700–900 cm−1 from the A60 (x = 60.2%) sample under the 266 nm excitation, and Voigt fittings of three modes of sapphire at 753 cm−1, AlGaN A1(LO) at 846 cm−1, and the surface optical (SO) mode between them (at 822 cm−1).
