Same diagrams as in Fig. 8 but covering only the region populated by the PMS-like stars towards the CO Cepheus void. In all the panels, we display the stars composing Cep III and its subgroup (i.e., Cep II) as blue and cyan circles, respectively. The red circles, the orange squares, and black diamonds correspond to the PMS-like that are non-members of Cep III, Pleiades-like stars, and older sources, respectively. In the upper panels, the big open hexagon marks the locus of the smaller concentration (i.e., Cep I).