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Example 3: a ATR–IR reflection absorbance spectra of an opioid sample (black), overlaid with library spectra of pure fentanyl and caffeine. b Powder Raman spectra and the corresponding library entries. c SERS spectrum of the drug mixture. d The GC total ion count chromatogram is presented, along with mass spectra of e fentanyl and f caffeine in the top panels, and library MS entries below in red
