Astrometric criteria for pair validation. In both diagrams, we plot pairs between primaries and secondaries with blue circles, tertiaries with red triangles, quaternaries with green squares, and higher order companions with purple diamonds. Left: ΔPA_1,i vs. µ_1,i ratio diagram. Vertical and horizontal grey lines mark the µ ratios of 0.15 and 0.25 µ and ΔPA of 15 deg, respectively. Compare with Fig. 2 in Montes et al. (2018). Right: distance of companions vs. distance of primaries. Diagonal lines indicate the 1.15:1, 1:1, and 0.85:1 distance relationships. The α Cen AB + Proxima system, at d ~ 1.3 pc, is not shown.