Radio buttons that enable you to select which independent variables are displayed on the x- and y-axes. This feature is useful when you have more than two independent variables.
Selecting a check box activates a grid that is perpendicular to the selected variables axis. The sliders enable you to adjust the placement of each grid. The resolution of each grid can be controlled by adjusting axis settings. Figure 4.9 shows a surface with the X and Y grids activated.
Figure 4.9 Activated X and Y Grids
