Results of principal component analysis carried out with NIR spectral data of “Vinagre de Montilla-Moriles” samples. The scores and loadings plots of the first two principal components (PC1 and PC2) are shown (A and B), as well as the results of principal component analysis (scores and loadings plots) of the first two principal components (PC1 and PC2) carried out with “Pedro Ximenez” wine vinegar samples (C and D). The acronyms for the different wine vinegar categories and PDOs are defined in Table 1.