Read the PHA spectrum (created in by using hrifits.cl) into XSPEC. Change the response matrix to ``new_mean_resp.fits'' or ``new_resp.fits'' using the ``resp'' command. Ignore the first two channels and channels where the count rate is zero, and fit as usual. Using this method, we find that the best-fit Raymond-Smith plasma temperature for 61 Cyg is 0.35 keV, and the reduced for 7 PHA bins (channels 3-9). The PSPC spectrum between 0.5-2 KeV is well fit by a single temperature Raymond-Smith model of tempretaure 0.368 keV. The agreement is good (and may be fortuitous!)
NOTE: when displaying HRI spectra in XSPEC, do not use the ``set plot
energy option''. The channel boundaries are not updated.