CMDs and TCDs of NGC 2453. Left panels: V − (B − V) CMD. Dashed and solid lines depict isochrones of 40 Myr and 50 Myr, respectively, shifted in magnitude for a distance of 4.7 kpc. Right panels: (U − B)−(B − V) TCDs. Black and red lines depict intrinsic and reddened isochrones, respectively, and the arrow shows the reddening direction. Bottom panels: zoomed region of the upper panels around the MLM stars. Light gray dots indicate the stars in the field along the line of sight of the cluster, black filled circles show the MLM stars, and open circles indicate stars with proper motions within 2σ of the cluster. Black empty dots are stars with upper distance errors ≤3.5 kpc from Gaia DR2, and the star in the square is MF 54. PARSEC + COLIBRI isochrones from Marigo et al. (2017) have been fitted to MLM stars.