What is the unit used in the 3 hour graph?

In the 5 minute graph, it’s clear the graph is displaying the current throughput per second. If the graph touches the 2 MB/s line, the throughput is 2 MB/s.

What does the 800MB line represent in the 3 Hour graph? 800MB over what period? Is it possible to set it to display throughput per second on all of the graphs?

Thanks for your feedback on the graph. Perhaps this page is useful?