Color-magnitude diagram for the Trumpler 5 OC. The mean position (intensity-averaged magnitude and color) of the RRL is shown with the (magenta) star. Cluster members from Cantat-Gaudin et al. (2020) are shown as (gray) dots. The dashed and dotted lines correspond to the instability strip limits from Marconi et al. (2015) and horizontal branch magnitude from the Garofalo et al. (2022) period-luminosity-metallicity relation at the star’s metallicity, distance and extinction of A_V = 1.65 ± 0.15 following M25 (see their Sec.3 for details). The insert shows the H-R diagram and the position of the star at ϕ = 0.3