Fig. 4
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eRASS:4 exposure-corrected intensity sky map, with identical parameters as the one displayed in Fig. 1. The blue contours mark the 4850 MHz radio data obtained from PMN (Condon et al. 1993) southern and tropical surveys, and GB6 (Condon et al. 1991, 1994). The magenta contours mark the optical Hα data obtained from the full-sky Hα map of Finkbeiner (2003), with 6′ FWHM resolution.
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