Macroclumping as solution of the discrepancy between Hα and P v mass loss diagnostics for O-type starsB. Šurlan, W.-R. Hamann, A. Aret, J. Kubát, L. M. Oskinova and A. F. TorresA&A, 559 (2013) A130DOI: https://doi.org/10.1051/0004-6361/201322390