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The OPLS-DA score plots of region multi-classification by HS-GC-IMS (A) and HS-SPME-GC-MS (C). (B) the permutation test results (n = 200) of the OPLS-DA model of HS-GC-IMS; (D) the per-mutation test results (n = 200) of OPLS-DA mode of HS-SPME-GC-MS.
