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GC-MS typical total ion chromatograms (TICs) of volatile compounds in the “Chenpi” (CP) sample (S5). (a) Extracted through hydro-distillation. (b) Extracted through headspace solid-phase microextraction (HS-SPME) at 30 °C for 10 min. (c) Extracted through HS-SPME at 50 °C for 10 min. (d) Extracted through HS-SPME at 50 °C for 30 min.
