LEGION: Space Density of Analysis Zone

When I create an Analysis Zone and Analysis that graphs the space density in that zone, is the space density simply calculated by the number of entities in the zone divided by the area of the zone?

Or is it an average of the density experienced by the entities in the analysis zone (i.e. density of zero in the zone wouldn't be taken into account), similar to how the cumulative mean for a density contour does not account for the duration where density is zero. 

Thanks, 

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