Similarly to Real-Time the Last 24 hours displays interface usage. The main difference being, this is populated with historical data and not real time. Also the time windows spans 24 hours and data resolution is 2 minutes.
Hours: change the displayed historical window.
Avg. allows you to apply percentile display (cut spikes)
Max: Uniform scales all the interface charts to max data point recorded amongst all the interfaces. Per If scales based on data relevant to the individual interface only.
Unit: kbit/KB, Mbit/MB - toggles between 1,000 and 1,000,000 display units
Display: Solid = represent usage with an area, Line = represents usage with a single line related to max value only.
Color: Switch between different preselected color combinations.