Example H_δ and H_γ lines that highlight the contributions from N III and O II in the blueward and redward wings, respectively. To clearly demonstrate the potential contamination, the displayed profiles are taken from spectra of two Galactic stars, with v sin i = 70 km s⁻¹ (solid) and v sin i = 310 km s⁻¹ (dotted); less severe but still problematic contributions are also present at the metallicity of the LMC.