• Dark Gray (Past): the switching sheets have an overlap, but the overlapping times on the sheets are in the past. To distinguish between the types of past overlaps, the foreground coloring will be set to Red, Orange, or White based on the type of past overlap it is. These colors have the same meaning as the background colors used to define the type of overlap for future overlaps. See the following color definitions for more details.

• Red (Device): The switching sheets have device overlaps.

• Orange (Control Zone): The switching sheets have control zone overlaps.

• White (Time): The switching sheets overlap in time only.