The complete figure set (11 images) is available in the online journal.

Color–magnitude diagram showing the age fits for Circinus subgroups and CIR-4 subcomponents. Here, we show CIR-1 (UPK 607) as an example, and the rest of the fits are available in the online-only version of this figure. The best-fit isochrone is provided by the thick red curve, and isochrones of 5, 10, 20, 40, and 80 Myr are overlaid for reference (from top to bottom).