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The HRI spatial resolution is characterized by a radial Gaussian
where 
.
The spatial resolution of the
XMA+HRI combination depends on the HRI, Aspect, and
Mirror performance. The on-axis point spread function for the mirror is
characterized by a radial gaussian with 
.
The aspect uncertainty has been measured to have a radius of
1.5'' (1 
) on the ground.
Taking the root sum square of all three contributing factors results in on-axis
resolution characterized by a radial gaussian with 
.