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POINT SPREAD FUNCTIONS - California Institute of Technology
The encircled energy is the fraction of the total integrated flux in the image contained within a given radius r. That is, EE(R) = RR 0 2π I(r)rdr/E 0, where E 0 = R∞ 0 2π I(r)rdr Real PSF’s often have very extended wings, so for the purpose of characterizing photometric performance we often use the 70% encircled energy diameter, EED 70.
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