Fig. 4
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Reduced χ2 maps for the equatorial rotational period Ωeq and differential rotation dΩ for Stokes I (bottom panel) & Stokes V data (top panel). The three, red solid lines illustrate the 1, 2, and 3σ confidence intervals. Middle panel: a comparison of 3σ regions for Stokes I in 2018 (blue), Stokes I in 2006 (black), and Stokes V (red). Crosses mark the location of peak values.
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