Please see the AXAF Proposer's Guide for more information on pileup. Nominal aim points of the detector arrays, and the positions used to derive effective areas using mkarf for this distribution. Comparison plots are available in Table 3 below. Hence the planning results should give a very similar set of results to those derived during subsequent analysis of real data, if the inputs supplied are accurate. The results are valid for -120C operating focal plane temperature.
All effective areas are for both positive and negative orders summed together.
The curves use the flight instrument chip layout properly accounting for both FI and BI chips. Since the energy response and spectral resolution of the two grating assemblies differ, separation of the output may be important for some observers. In all cases the output is for isolated first order. The energy resolution of the ACIS instrument will allow the user to separate this from the higher order light. See the AXAF Proposers' Guide for more information.