Pairwise genetic correlations are presented in Table S2 and illustrated in Figure 3 . Genetic correlation estimates among most ITs were generally weak but a few high genetic correlations were observed. The number of positive genetic correlations (310) was higher than that of negative correlations (183), as already observed for phenotypic correlations. Positive genetic correlations were higher (in absolute values) than negative ones (Table S2, Figures 3 and S1). Only 28 (2.7% of the total number of correlations) and five r ĝ (0.4% of the total number of correlation estimates) were higher than 0.4 or lower than -0.4, respectively.