Dereddened r-band photometry and r – i colors for M-type stars that fall into the clustered population locus (i.e., above the red line) on the diagrams shown in Fig. 10 (left panels). Sources extracted from the photometric clustered population locus and spatially projected onto the central part of the field are highlighted further as black points. The 0.5 Myr and 5 Myr PMS model isochrones from Marigo et al. (2017), brought to a distance of 800–900 pc, are overplotted to the datapoint distribution to mark a tentative age range for the clustered population.