Position (top), proper motion (middle), and radial acceleration (bottom) uncertainties as a function of K magnitude (left) and number of epochs (right) for our sample of young stars beyond a projected radius of 0 8 and in the central 10'' AO data set. Note that the acceleration uncertainties are shown in μas yr ⁻². The astrometric uncertainties are estimated from either the proper motion or acceleration fit to each star's individual positions over time. Stars with acceleration detections and acceleration constraints are shown as open red circles and open green squares, respectively. The figures show that our astrometric uncertainties have only a slight dependence on stellar magnitudes and a strong dependence on the number of epochs a star was detected in.