In general, the ACS channels encircled energy distribution has been found to be within the original instrument specifications. Figure 5.9 and Figure 5.10 show the ACS encircled energy curves derived from on-orbit images. Tabulated values of the encircled energy for most filters are available in Sirianni et al. (2005, astroph/0507614) (http://adcam.pha.jhu.edu/instrument/photometry/sirianni.pdf
).
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