Top panel: HRD with the observed positions and 1σ areas of both components of KIC 10080943, marked by the boxes (the primary is the cooler, more luminous star). The positions of the components in Model 2 are given by the diamonds and for Model 3 by the squares, while the respective evolutionary tracks are given by the red and black solid lines. Dark blue symbols mark the primary, while the light blue symbols indicate the secondary models. Parameters of these models are given in Table 3. Lower panel: asymptotic period spacing ΔP as a function of central hydrogen mass fraction X_c. The observed mean period spacing of the primary (secondary) is given as the horizontal solid (dashed) line and the 1σ areas are shown as the grey patch.