Fig. 1From: Geographical origin classification of Phoebe zhennan and Phoebe bournei by solid phase micro-extraction and gas chromatography-mass spectrometryGC–MS total ion chromatogram of Phoebe zhennan. a GC–MS total ion chromatogram of specimens from Hubei. b GC–MS total ion chromatogram of specimens from Sichuan. c GC–MS total ion chromatogram of specimens from Yunnan. d GC–MS total ion chromatogram of specimens from GuizhouBack to article page