593: Category Shading on Graph
The category shading on graph option allows you to specify whether the background of the graph should be shaded to indicate the below-normal, normal and above-normal categories. Dotted lines are added to the graph to indicate the categories regardless of whether the shading is added, and so the categories remain identifiable. The option toggles the shading of the categories on and off. A tick is indicated next to the menu item when the shading option is on.