Companion astrometry overlaid on the background hypothesis for each of the candidate companions identified in 2016 data. In each case, colored points represent the measured position and 1σ uncertainty of the companion (also listed in Table A.1); the black trace indicates the long-term motion of an infinitely distant background companion, with black circles indicating positions at the observation epoch. All companions move broadly in the direction expected for a background object, though there is some scatter – implying a small proper motion of the background objects themselves. Considering the astrometry, as well as the wide separation (all >3.5″), all of these candidate companions are background objects. Companions CC2 and CC5 are also detected in the Gaia catalog, further confirming their identity as background objects.