CMDs of the selected background fields. Each panel represents a different field (B0–B5). For the background-less field (B0), the CMD of the generated cluster (log(M/M_⊙) = 4.5, log(t/yr) = 8.0), assuming photometry errors from Williams et al. (2023), is shown. Stellar photometry for fields B1–B5 was taken from Williams et al. (2023). The number of stars visible in the CMD is indicated below the field name. Coloured curves represent the PARSEC-COLIBRI solar metallicity isochrones for log(t/yr) = 8.0 (cyan), 8.5 (blue), 9.0 (orange), 9.5 (magenta), and 10.0 (red) ages. The black arrows mark the extinction vectors, calculated using the Fitzpatrick (1999) extinction law with A_V = 1.