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Independent pathway model presenting the standardized squared path estimates for the 10 spatial tests. 2D, 2D drawing; 3D, 3D drawing; A, additive genetic components of variance; C, shared environmental components of variance; CS, cross-sections; E, nonshared environmental components of variance; EM, Elithorn mazes; MR, mechanical reasoning; Maz, mazes; PA, pattern assembly; PF, paper folding; PT, perspective-taking; Rot, mental rotation.
