Top: completeness and reliability curves as a function of the LR threshold (LRth) in ELAIS-N1. The LRth (= 0.056; vertical line) is chosen as the cross-over point of the two curves, achieving both completeness and reliability > 99.7%. Bottom: probability of a LR-match being a genuine cross-match as a function of the LR threshold,as it is lowered (see text and Nisbet 2018 for more detail). At the adopted LRth, the LR matches have a probability of just over 50% of being genuine counterparts, confirming that this threshold maximised completeness with limited loss of reliability.