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M81 (NGC3031) by Mike van den Berg & Mathijn Ippel
Submitted January 18, 2014 by Planewave Instruments
RGB data captured with the CDK12,5 and the luminance data with the CDK17 and the SBIG STL-11000M & AO-L.
NGC3031: LRGB = 2310:270:270:270 minutes. ( spring 2011 )