Fig. 2
Frame of the RM-synthesis cube at Faraday depth
φ = −1 rad m-2 displaying the extended polarized
emission. Grating rings can be seen around the bright point sources at
(close to the edge of the
image), and 
. The drawn boxes are chosen
to infer the noise behaviour (box 1) and derive the
cross-correlation profile (box 2), see text.
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