Comparison of the (left) VLSS and (right) VLSSr for two extended objects. (Top) Abell 194 is two luminous and distorted radio galaxies at the center of a low-redshift galaxy cluster. The improvement is due to a combination of increased extended source sensitivity and lower noise. (Bottom) W41 is a giant shell-type supernova remnant in the Milky Way. The improvement is due to the improved RFI suppression and the increased extended source sensitivity.
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The NSF National Radio Astronomy Observatory and NSF Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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