These files are suitable only for the preperation of proposals. Do not use them for analysis of actual data.

Both the RMF and ARF files are necessary for simulation of data. The XRS ARF includes the transmission of the thermal shield, the XRT-S effective area, and the transmission of the filters on the wheel (unless "open"), while the XRS RMF includes the transmission of the blocking filter and the quantum efficiency of the absorbers.

• XRS RMF (xrs_ao1.rmf)
  Instrumental broadening is modeled using a single Gaussian function, and assumed to have a 6.5 eV FWHM resolution throughout the entire energy range (0-16.384 keV). The energy bin size is 0.5 eV, and the channel bin size is 1.0 eV.

• XRS ARF (xrs_onaxis_open_ao1.arf)
  An ARF for a point source observed on-axis; the effective area is for the Au-coated XRT-S integrated over the 30 active XRS pixels (i.e., this excludes the "CAL pixel," No.3, and the non-connected channel, No.2). The pixel size of the XRS is 624 um and the gap size is 16 um. The filter wheel is set to the "open" position.

  For the 10% neutral density filter, use this ARF and multiply the result by 0.0953. This is the actual measured transmission of the filter, which is indeed energy-independent to the systematic accuracy of the calibration (~0.1%).

• XRS ARF (xrs_onaxis_be_ao1.arf)
  Same as xrs_onaxis_open_ao1.arf, but the filter wheel position is set to "Be."