Fig. 4.
Rotations with Φ = 2°. Black: Ψ = 90° and the loop in (b) encloses the origin. In (c), the two steps in EVPA are in the same direction and the net rotation is 180°. Red: Ψ = 87° and the loop in (b) does not enclose the origin. In (c), the two steps are in opposite directions and the net rotation is 0°. Note that the Q and U scales are different in (b).
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