PITL. Shown is the spread of centroid position measured by the IFSW and quantified using the 1-sigma 68th percentile of the distribution for isolated stars only. The colour code shows the image cadence. The inset shows a subset having only cadences > 24 seconds where no imagettes are created, and no image stacking happens. The blue points represent high cadence data, and they sample the high-frequency jitter component that appears to have an amplitude of about 0.5 to 0.6 arcsec-onds.