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Fig. 3

image

Depolarization along the western shell of the W4 superbubble at λ6 cm (panel a)), where total intensity contours start at 4.9 mK Tb and run in steps of 3.0 mK Tb, and at λ11 cm (panel b)) where total intensity contours start from 9.0 mK Tb in steps of 13.5 mK Tb, and at λ21 cm (panel c)) where the total intensity (DRAO interferometer + Effelsberg + DRAO 26-m) contours run from 2000 + (n − 1) × 50 mK Tb (n = 1, 2, 3, 4), and 2500 + (n − 5) × 800 mK Tb (n = 5, 6, 7, 8). The angular resolutions for the λ6 cm, λ11 cm, and λ21 cm images are 95, 43, and 3, respectively.

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