Figure 4. Scatterplots illustrating the relationship between AST and SER errors in the inferior meridian. A: Linear regression between the SER error with the AST at the 4-mm location (red empty circle) and averaged peripheral AST (black-filled circles). B: Linear regression between an SER error with the AST at the 5-mm location (red empty circle) and averaged peripheral AST (black-filled circles). The linear regression equation results of AST at the 4-mm and 5-mm locations are displayed in the graph. Each scatterplot contained 170 image data from 170 patients.