The distributions of offsets in position (right ascension (top) and declination (bottom)) from the mean for multiply-detected sources. For each source with 2 or more detections, the mean-subtracted residuals of position for each detection were calculated. The residuals were normalized by the errors calculated from the Monte Carlo noise simulations, and the resulting distributions are shown. The dashed lines are the expected distribution if the errors are correctly calculated: normal distributions with a variance of 1.0 and normalized to the total number of detections.