Structural residuals are variances and covariances of residual (error) variables in the structural part of the model. If there are no residual variables in the structural part of the model, the Structural residuals caption is disabled.
Click the Structural residuals caption to display in color the residual variables in the structural part of the model, and any covariances among them. If you have previously selected Alternative to color (See To change accessibility settings), the same variables and covariances are drawn with extra-thick lines in the Amos Graphics window.