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Due to the inherent statistics of the primary electron generation,
the intrinsic spatial resolution of the ROSAT PSPC is expected
to be a Gaussian.
Theoretically its width is 
and independent
of 
.
All photons not in the other two components are assumed to be
in this component.
Thus the fraction of photons within this component as a function
of energy is given by:
Note that this becomes zero above 2 keV from equation 10.
The derived analytical form for the width of the detector gaussian,
, as a function of energy is given by:
The analytical form for the Gaussian mirror blur is
These two Gaussian widths are combined as follows:
The normalization, 
, is given by
where the denominator is the renormalization factor such that
the integral 
over the range
equals 
.
This model has been tested against in-flight data and the model and test results are written up in [Hasinger et al.1993].
