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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].