Fig. 8
Data points represent the HeII λ4686 emission line polarization from HPOL at PBO (open squares) and HPOL at Ritter (filled squares). From top: projected %qp Stokes parameter and projected %up Stokes parameter versus phase (see text; rotated by −15°). The solid horizontal lines mark error-weighted mean values of %qp and %up for the phase regions they span; 1σ uncertainties are shown in gray. Dotted vertical lines represent phases 0.0, 0.5, and 1.0. Dotted horizontal lines mark zero in %qp and %up.
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