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The PLS-DA results of YB4 with different NaCl concentrations using GC-MS and GC-IMS. (a) PLS-DA score plots via GC-MS; (b) PLS-DA scores plots via GC-IMS; (c) cross-validation plot after 200 permutation tests for GC-MS; (d) cross-validation plot after 200 permutation tests for GC-IMS.
