Fig. G.3.

Histogram of the difference in polarization angles between Planck-derived angles and optical-polarization-derived angles, ΔψS/V = (ψ+90°) − ψV, with its standard deviation σS/V and median value indicated. Histograms are overplotted for simulations based on noise only (dashed red curve), and noise plus systematics (dashed blue curve) – see text. For easier comparison, the latter histogram has been shifted horizontally by −31 to peak at the same position as the data.
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