Radial dependence of line profile variability in seven O9–B0.5 stars F. Martins, W. Marcolino, D. J. Hillier, J.-F. Donati and J.-C. Bouret A&A, 574 (2015) A142 Published online: 09 February 2015 DOI: 10.1051/0004-6361/201423882