Variations of the abundances as a function of the apparent stellar parameters. Non cluster-members (Sect. 3.3) were excluded. Stars with or without a binary flag are shown with open and filled symbols, respectively. Stars flagged or not as line-profile variables are plotted as squares and circles, respectively. For both variability types, a confidence level ‘A’ or ‘B’ is required. The benchmarks are shown with star symbols (for convenience, the position of those discussed in Sect. 7.3 is indicated in the panels showing the behaviour of the N and [N/C] abundances as a function of T_eff). Crosses show illustrative error bars. The Si II and Si III data are plotted together in the same panels. The horizontal, dashed line indicates the solar abundance (Asplund et al. 2021), while the horizontal stripe shows the mean values (±1σ) for stars in NGC 3293 determined by Hunter et al. (2009). The values are provided in Table 6. The rightmost panels show the breakdown of our abundance data for the NGC 3293 sample.