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The HRI spatial resolution is characterized by a radial Gaussian
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 .