Figure 1c: Correlation matrix of sperm number, motility, morphology, semen volume and 8 metals (Rb– Zn). Correlations (r ≥ 0.2500) between sperm properties are colored in yellow and high correlations (r ≥ 0.5000) are colored in green. Negative correlations (r ≤ −0.2500) are colored in gray.