Figure 1.

Heatmap and dendrogram representation corresponding to the 71 volatile compounds of the six Vitis vinifera L. monovarietal wines under study: Sauvignon Blanc (class 1, red), Arinto (class 2, green), Bical (class 3, dark blue), Baga (class 4, blue), Castelão (class 5, purple), and Touriga Nacional (class 6, yellow). The relative content of each compound is illustrated through a chromatic scale (from dark blue, minimum, to dark red, maximum). Dendrogram for the HCA (hierarchical cluster analysis) results, using Ward’s cluster algorithm for the data set, was also included. Detail data are reported in Tables S1 and S2 for white and red wine varieties, respectively.