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The design distance between the XMA and PSPC is such that keV photons of an on-axis source are brought to a focus (along a surface of a cone of half-angle ) at an optimum depth within the PSPC drift region, such that the Gaussian spatial distribution of pulses on the cathode wires is minimized. Consequently the image of a point source is sharpest at 1 keV.

The combined contribution of focussing and the finite
penetration of photons into the counter on the PSF can be
modelled as an exponential function
where *r* is the radial distance from the
centroid position of the radial profile, in arc minutes.

The e-folding angle, , was found to be

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