Time-distance histograms of encounter candidates between HMXBs and Galactic spiral arms in the past 100 Myr. Dotted white lines represent the median distance, and the 1 to 3σ intervals are represented from dark red, to red, to orange. The distance is the one in the plane of the Galaxy (XY plane). The black vertical plain and dotted lines provide our estimation of the age since supernova in each binary-arm encounter candidate.