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[submitted] Properimage

This code is inspired on Zackay & Ofek 2017 series of papers "How to coadd images?". It can perform the statistical proper-coadd of several images using a spatially variant PSF estimation, and also difference image analysis by several strategies based on the Zackay, Ofek and Gal-Yam methodology on "Proper image subtraction - optimal transient detection, photometry and hypothesis testing". It is Open Source, and is written in Python Programming Language, is object oriented and extendable.

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