Accuracy of Polarization Efficiency/Angle


Estimated by repeatability between measurements with source horiz/vert and with different source appertures.
Random error in efficiency averages down over array
Systematic error leads to incorrect pol map cal
Estimated sys uncertainty 0.02
Random error on angle averages down across array
Systematic error leads to E->B mixing 
Estimated sys uncertainty 2 deg
But in sim 5 deg bias has no effect for QUaD's sensitivity level!