How can I view the 'total volume' stats of my netflow devices in a map?

I am setting up a map that provides an overview of the netflow of our routers. I need to be able to view the 'total volume' of each router and include this in the map. Is there a way to change the vertical axis of my netflow graphs to show total volume instead of kbit\s? or.. Is there a way to include a 'total volume' column in the favourite sensors table? or.. Is there a different table that includes 'total volume' information?

Thanks!