Fig. 1
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Compilation of the data used in this paper. Upper panel: extra-galactic RM skymap, smoothed and cleaned by Hutschenreuter et al. (2022). We note that in our main analysis, we start with the individual RMs from the CIRADA catalog. The RM skymap from Hutschenreuter et al. (2022) is shown for clearer visual representation. Middle and bottom panels: WMAP synchrotron Stokes Q and U skymaps at 23 GHz (Bennett et al. 2013).
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