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. 2023 Jul 11;9(7):e18148. doi: 10.1016/j.heliyon.2023.e18148

Fig. 2.

Fig. 2

Schematic diagram of breast tissue before and after spectral preprocessing (A): Typical original spectrum and preprocessed spectrum with Savitzky-Golay smoothing; (B): Preprocessed spectrum with SNV and preprocessed spectrum with airPLS.