Change in the PSF centroid location as a function of wavelength for 5–28 µm data cubes constructed from dithered observations of a variety of standard stars observed by PIDs 1050, 1524, 1536, and 1538 (processed using the distortion solution derived in this work). The top panel shows offsets along the α direction, and the lower panel offsets along the β direction. Three different sets of data points are given for 10 Lac Observation 17 as these data were obtained during three complete rotations of the DGA assembly while the guide star remained locked explicitly to test the position repeatability of the DGA. While the typical rms is much better than 10 mas for the β direction, repeatability in the α direction is about 30 mas rms.