Color–magnitude diagrams for Regions 1 and 4 for Gaia DR2 data, corrected from extinction and reddening and with distance estimated inverting the nominal parallax; for comparison, GALAXIA predictions are shown as gray dots. Shown are (from top to bottom) PARSEC+COLIBRI PR 16 isochrones with solar metallicity of 10 Myr (gold line), 50 Myr (dashed blue line), 100 Myr (solid red line), 150 Myr (dashed green line), and 2 Gyr (solid gray line).