Left: spatial offset of pulsar and TeV wind nebula as a function of pulsar characteristic age. The dashed and dotted lines indicate the systematic minimum of about 0.015° and the association criterion of 0.5°, which are both projected to the average PWN distance of 5.1 kpc. The solid line shows the offset one would expect from pulsar motion only (assuming a large pulsar velocity of 500 km s⁻¹ ). Right: time evolution of the containment ratio. Since the pulsar motion can be assumed to be constant and the expansion decelerates, one expects the containment fraction to increase and eventually pass unity after some tens of kiloyears. The dotted horizontal line shows the rating criterion (offset/extension <1.5) applied in the post-selection of candidates (Sect. 6).