Fig. 3.

Parental shared environment $\left(\widehat{\xi }\right)$ under simulation models with varying proportions of E1 explained by genetics (x). σ_G1²=0.03, σ_E1²=0.18, σ_G2²=0.37, σ_E2²=0.42. E1 is partitioned into a genetic component E1G (σ_E1G²=σ_E1²(x)) and an environmental component E1E (σ_E1E²=σ_E1² -σ_E1G²), where x ranges from 0.0 to 0.75 with 0.05 increments.