Kiel diagram for models of program stars in NGC 6910. The green area limits the location of models with ages between 9.25 and 11.61 Myr in the core hydrogen-burning phase (main sequence) with 0.0 <  α_ov <  0.4 and 97 km s⁻¹ < V sin i <  250 km s⁻¹. The red lines stand for the ZAMS and TAMS phase. Black lines are evolutionary tracks for 5, 7, 10, 15, and 20 M_⊙. Blue lines are isochrones for 9.25 and 11.61 Myr. Evolutionary tracks and isochrones are shown for V_eq = 170 km s⁻¹ and α_ov = 0.2. For each program star (labelled with number) the adopted range of T_eff (Table 2) is marked by a blue bar in the lower part of the plot.