Classical HR (left) and KDs (right) for sample stars, plotted against current Geneva and Bonn tracks with rotation. Symbol coding as indicated in the left plots; fast rotators and magnetic stars are additionally highlighted by large circles and squares, respectively. Objects showing a trend towards a positive (M_evol > M_spec) or a negative(M_evol < M_spec) mass discordance are denoted in green and purple, respectively; those indicating M_evol /M_spec around unity without any systematic trend in magenta. Dotted lines represent corresponding isochrones at 1–5 Myr. Numbers from 1 to 6 denote the outliers as discussed in Sect. 6.1 and Appendix B. For more information see Fig. 11 and Sect. 6.2.2.