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As we have it in equation 8.5 , it is necessary to correct fluxes for the losses of opening. After having carried out the subtraction we corrected for the loss of opening according to the method described above.
Figure 8.24 shows the evolution of the energy encircled according to the ray of opening used to measure flux. The typical correction for a ray of opening of 5 (0.2 seconds of arc) pixels is 15% for filter F814W.