Astrometric measurements of DF Tau B relative to DF Tau A (+ symbol). The best orbit of DF Tau B from Allen et al. (2017) is shown with a dashed gray line, while the data points used to fit that orbit are shown with gray stars. The positions of DF Tau B relative to A measured with ALMA and VLTI-GRAVITY are shown with colored stars, while the solid circles show their expected position using the Allen et al. (2017) orbit. The offset from the Allen et al. (2017) orbit is within the orbital uncertainties, as shown by the red curve in the inset, which is a manual fit to the ALMA and VLTI-GRAVITY points that is within the uncertainties on the orbital parameters.