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Fig. 1

image

Stokes I,Q,U and null polarization N LSD profiles of Betelgeuse for NovemberDecember 2013–January 2014 (left, Set 1) and September 2014 (right, Set 2). The upper panel shows IQ,U intensity profiles, the second panel shows Stokes QU profiles, the third panel shows the null polarization NQ,U profiles and the bottom panel shows the linear polarization profiles (blue for Stokes Q and red for Stokes U). The vertical lines correspond to Betelgeuse’s heliocentric radial velocity.

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