more pinion angle fun

[rockdogz]

I've been reading up on pinion angle, and I still don't get it.
My measurements are:
drivetrain angle pointing 1.4 degrees down (measured by bottom of oil pan)
rear end pointing 2.2 degrees down (measured across face of rear end housing perpendicular to ground
So is my pinion angle -3.6 degrees?

Some more measurements that may or may not have any bearing:

driveshaft is 3.1 degrees down towards rear of car
ground sloping 0.3 degrees towards rear of car