Combined λ21 cm polarized emission of the W4 superbubble with data from the DRAO interferometer, the Effelsberg 100-m, and the DRAO 26-m single-dish telescopes at an angular resolution of 3′. Overlaid λ21 cm contours are from the source subtracted and spatially filtered total intensity map (see text). Contour lines run from 2000 mK Tb in steps of 50 mK Tb.
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