Distribution of DET_LIKE_2 (0.6–2.3 keV) values. The hard sample is shown as a black solid line, and is further subdivided into non-flagged point-like hard sources and point-like hard-only sources (blue dashed line and orange dotted line, respectively). The hard-only samples as defined in Merloni et al. (2024) are also shown: the higher-fidelity, UID_1B=0 sample (pale orange dashed line) and the less pure UID_1B≤0 sample (dark red dash-dotted line).