Fig. 4.
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χ22 map resulting from smoothing the Stokes I, Q, and U and their variance map with a Gaussian kernel of width σ = 58″.3, corresponding to 2.5 pixels. The arrows indicate the magnetic-field vectors for pixels with polarization significances > 2σ within a 5′ radius circle. For regions with ≥3σ, χ22 ≥ 11.8, the vectors are thicker.
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