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The spatial response of the PSPC has been calibrated; residual position
errors of 2.5'' will remain and are likely to be unimportant in the overall
error budget. The attitude solution is specified to
12'' in the survey mode. For weak sources (i.e., sources with
counts), 1 
error radii <25'' due to the photon
statistics are expected, while for strong sources the uncertainty in source
location will presumably be determined by the uncertainty in the aspect
solution.