Examples of line fits for enriched stars, ranging over spectral types and nitrogen ionisation stage used. The observed spectrum is shown in blue, the best fit model in black (the measured ε_N is annotated in the panel), models representing the upper and lower 1σ error in dashed black, and a FASTWIND model with ε_N = 7.33 in red. Only one of the lines used is shown for each source. All sources need a significant nitrogen enrichment in order to reproduce the observed profiles.