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Bivariate ACE model, visualizing contributions of genetic (A), shared environmental (C) and unique environmental (E) on two variables. Paths a11-e11 and a22-e22 indicate contributions of genes and environment on variables 1 and 2, respectively. Paths a12-e12 indicate contributions of the factors for variable 1 to variable 2. rg = genetic correlation, rc = shared environmental correlation, re = unique environmental correlation, rp = covariance.
