Selection of binary stars in construction of the KiDS-Legacy lensing sample. Left: distribution of all DR5 sources in size and apparent magnitude. Centre: distribution of all sources remaining prior to the rejection of binary stars, which have ellipticities |∊| ≤ 0.8. The colour scale in the centre panel is the same as in the left panel. Right: as in the centre panel, but for sources with ellipticities |∊| > 0.8. This is the space in which the binary rejection is performed. The binary rejection criteria used in previous KiDS releases is shown as the dashed red line. The new binary rejection criteria for sources in DR5 is shown as the solid red line (sources above the line are discarded).