Joint Kiel diagram for nine program stars in NGC 6910. Only models comprising the five criteria defined at the beginning of Sect. 5.4 are plotted as colour dots, with the colour corresponding to the value of η (right side bar). The filled and open squares denote the positions of the program stars according to the adopted parameters from Table 2 and to the final determination from the EnsA (Table 4), respectively. The black line is the 10.6 Myr isochrone calculated for V_eq = 170 km s⁻¹ and α_ov = 0.2.