What does the legend value mean in a Kernal Density Map

Discussion created by casforain on May 8, 2012
Latest reply on May 18, 2012 by erice-esristaff
I was trying to create a heatmap for bus routes.

Inputs: Bus Routes (Polyline)
Population Field: Number of trips per day made by each bus route
Cell Size: 25 Square Feet
Search Radius: 1500 feet

The result looks like:[ATTACH=CONFIG]14172[/ATTACH]

My question is: How to understand the value of 12.84?

Thanks a lot!