Table 4. J₂ criterion calculated for each class (cultivar) in the two harvesting years by considering the first two, three, and four PC components in the PCA performed on the whole dataset (reported in Fig. 1).

	72.6% variance (2 PCs)		80.2% variance (3 PCs)		85.3% variance (4 PCs)
J2 values	2013/14	2014/15	2013/14	2014/15	2013/14	2014/15
Cima di Mola	24.92	46.33	113.13	321.78	119.309479	924.092661
Coratina	4.01	6.51	4.63	10.60	10.82181	10.932898
Ogliarola	15.68	20.29	13.89	72.43	40.004852	1584.137069
Peranzana	8.00	16.36	13.20	108.67	26.428358	682.562196