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The ROSAT PSPC cannot always properly position X-ray events with
very low energy.
This results in an extension to the image caused by the detector
response to very soft X-ray photons, but one which will not fit
any psf model. The effect is very pronounced below channel 15
( 
keV) but is not evident above channel 20 ( 
keV).
For a detailed description see
Sect. 7.1.1
and
[Nousek and
Lesser1993].