This is a function to set the H/V ratio of a graph plotted on the display window. The default ratio is set to match with the display window. However, on some occasions the user may want 1:1 ratio (a square graph) or any other specific ratio. At this time, the ratio setting in the display window setting dialog box can be utilized. In case the user has configured the H/V ratio setting, the graph will expand or compress maintaining the preset ratio when the size of the display window is adjusted.