Near-infrared CMDs for selected VVV GCs with assigned RR Lyrae members. The diagrams include only stars located in the innermost GC regions (r ≤ 1.0′), selected as candidates by our PM XDGMM classifier. RR Lyrae stars for each GC are overplotted, with RRab stars represented as blue triangles and RRc stars as green squares. Dubious candidates are highlighted with red circles. A complete version of this figure, showing all 26 VVV GCs with assigned RR Lyrae members, is provided in Fig. B.1.