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Fig. 7

image

Schematic representation of the spiral arms and bar (thick solid line) in M83. Each of the two arms (labelled I and II) is separated into three sections, labelled as a, b, and c and shown as solid, dotted, and solid lines, respectively. The background image represents the cold dust distribution. The axis scale is in kpc, assuming the distance to M83 of 8.9 Mpc.

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