THINGS total HI map (contours, Walter et al. 2008) of the area surrounding M 81 overlayed on the SPIRE 250 μm map (greyscale). The map has been integrated over a velocity range of about 250 km s-1. Contours are from 50 to 500 Jy beam-1 m s-1 every 100 Jy beam-1 m s-1.
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