Comparison of C/N ratios of investigated stars with theoretical models for solar-metallicity stars. The filled symbols are for stars with evolutionary stages determined with higher confidence. The solid black line represents the C/N ratios predicted by the model for stars after the 1 DUP, taken from Charbonnel et al. (2017). The dashed red line represents the minimal values in the model with thermohaline-induced extra mixing (TH), taken from Lagarde et al. (2017). The dotted red line represents the minimal values in the model with thermohaline- and rotation-induced extra mixing (TH+ROT), taken from Charbonnel et al. (2017).