Abstract
Observed limits on diffuse X-ray emission from M101 require that the temperature of any coronal or matrix hot gas which is radiating an appreciable part (10 percent) of the average supernova power be less than 10(5.7)K. Furthermore, the fraction of the galactic plane occupied by hot bubbles similar to the one which apparently surrounds the sun is at most 25 percent in the region between 10 kpc and 20 kpc from the galactic center.
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