Top: CMD of the central part of the cluster (11 arcmin², grey dots). ab- and c-type RRL are marked as red and blue circles, respectively. RRL from Weldrake et al. (2007) are marked as star symbols. Open circles mark the new RRLs found in this work, with NV455 and NV456 (labeled) likely being cluster members (see Sect. 3.3). Field, blended, or erroneously classified stars are labeled and explained in the text. Bottom: zoom-in around the RRL region in the CMD of ω Cen, with a few noteworthy stars labeled. V43 and V60, marked with green triangles, are known Type II Cepheids.