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Fig. 2

image

Comparison of the images of the two fields, shown both individually and then combined. The left panel shows the linearly polarized emission using only field 1, the second panel presents the same emission but using only field 2, and the third panel shows the combined image. The contour levels are always chosen as the 4σ levels of the combined image where 1σ is 6 μJy beam−1. The right panel presents the mask created from the combined image and the residuals of each individual image following Matthews et al. (2014); see Sect. 2. The contour level is set to 1, corresponding to the 3σ confidence level in Matthews et al. (2014). The beam sizes are shown at the bottom-left of each panel, and the combined image also shows a scale bar.

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