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Two new results on the structure of the spiral arms of M83=NGC 5236 are presented and discussed, using the nonthermal radio continuum brightness and polarization distributions as diagnostic tools. First, the radio continuum emission located along the inner eastern arm of M83, in the neighborhood of a prominent chain of H II regions near the minor axis of the galaxy, is mostly nonthermal. It is plausible that the CO emission which has been observed in this region has been Enhanced by a localdoi:10.1086/133219 fatcat:m4b3h7slinarvjzr5tlwqx4tue