In W3Pimms this has been simplified into the 4 base detectors. The output will reflect all of the possible grating combinations. These have been updated based on new results from in flight calibration data. The resulting effective area does not account for the problem of pulse pile-up, which will impact any observation that will generate more than a few hundred counts in a 10 ksec exposure.
All effective areas are for both positive and negative orders summed together.
The curves use the flight instrument chip layout properly accounting for FI 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. Since the HRC has no energy resolution, order separation will be an issue for this instrument combination.