Comparison between single evolutionary tracks Ekström et al. (2012) and a MESA model with a merger (purple broader line) for HD206165. The squares with numbers are the ages in units of 10⁵ yr for the Ekström et al. (2012) tracks while the white squares show the same time difference for the merged model. The shaded region in pink shows the core-He burning phase. The arrow indicates the point of the 15 M_⊙ evolutionary track where the merging (mass addition of 7 M_⊙) happened.