B − I,V Optical Colour-Magnitude Diagram of the Galactic globular ω Centauri (Braga et al. 2016). Black dots indicate cluster stars, selected according to radial distance and photometric error. The cyan circles and red squares indicate candidate cluster first overtone (101 RRc, −0.6 ≤ log P ≤ −0.3) and fundamental (85 RRab, −0.33 ≤ log P ≤ 0.0) RRLs, respectively (Braga et al. 2016). The blue diamonds denote TIICs (7, 0.05 ≤ log P ≤ 1.5), based on mean magnitudes derived in Braga et al. (2020). The magenta asterisks show a selection of cluster LPVs (1.58 ≤ log P ≤ 2.72) identified by Lebzelter & Wood (2016), but based on our own photometry.