Neutral hydrogen distribution of the southern spiral galaxy M 83. Left: large-scale moment-0 map of the extended H i gas distribution, constructed from mosaic data obtained with both the 21 cm multibeam system on the 64 m Parkes dish and ATCA. Right: ATCA high-resolution H i moment-0 map (red contours) overlaid onto the WISE 12 μm map (gray scale, log-stretch) of the central disk (denoted with a gray box in the left panel). The H i contour levels are 0.1, 0.27, 0.43, and 0.6 Jy beam ⁻¹ km s ⁻¹. The ATCA beam is approximately 10'', comparable to the WISE 22 μm band, but note that the diffuse gas (see the left panel) is resolved out when emphasizing the longer ATCA baseline measurements.