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. 2020 Jan 17;8(1):128. doi: 10.3390/microorganisms8010128

Figure 4.

Figure 4

Principal component analysis (PCA) biplot of (a) impedometric parameters for each strain and (b) of the identified volatile compounds in the selected strains. Position of each strain is reported as a black dot, blue arrows represent variables. For panel (b), variable abbreviations are as reported in Supplementary Table S1.