CamAdvance or sparkadvance?

Please take a look at this data grabbed via OBD from an E46 318i (Valvetronic) (last graph)

I'm puzzled about the Advance Value (OBD PID mode 0x01 0x0E). The value is suposed to be Timming Adv. in relative to Cyl #1.
But I'm a but puzzled.. It throws values of about 40 some times.. and about -2 to -3 immediately after throttle release. These values refer to spark advance or the cam advance of the valvetronic system?
Is 40 at 1500rpm a "normal" value? Cos at about 5000rpm is also reads about 40
Can someone shed some light on this? Just out of curiosity....
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