(a) Upper CMD of proper motion probable members (P_μ ⩾ 19%) from P11 with blue HB candidates highlighted in blue diamonds. Small light gray points are stars with P_μ < 19%. (b) CMD, including radial velocity membership determinations. Single members (SMs) are shown as black points, circled points indicate binary likely members (BLMs). Gray points are SMs and BLMs with 1% ⩽ P_μ < 19%. Gray "⊗" symbols mark candidate binary members currently classified as binary unknowns (BUs) or binary likely non-members (BLNs), discussed in Section 6.1.