= Summary = 
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A gallery of diffim issues with PS1/GPC1 data prompted by Steve Hartung visit the week of Feb. 25, 2013 demonstrating/testing his method of ''Image subtraction noise reduction using point spread function cross-correlation''  [http://arxiv.org/abs/1301.1413].



= warp-warp =


= warp-stack =



= stack-stack =