Locations of the elongated structures, on the scale 2a = 1′, of the combined polarized radio emission (P6+P13; black isocontour at 20% maximum intensity) and in the distributions of H I (top panel) and warm dust (bottom panel), respectively, shown in colour and as dotted contours at 20% of its maximum intensity. The axis scale is given in kiloparsecs assuming the distance to M83 of 8.9 Mpc. The dashed ellipse shows the corotation radius.
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