Access data from PVS system

I would like to access the data generated by Unity’s Occlusion culling. I want to use Unity’s abilities to bake the data but then use my own custom way to use that data for culling. Is this possible ?

I also want to know if there is API that can access to occlusion data. I only see that PVS data is stored inscene file, but have no idea how to deal with it.

PS: I am using Unity 4.6.6
64413-pvsdata.png