Shaping the distribution of vertical velocities of antihydrogen in GBAR G. Dufour, P. Debu, A. Lambrecht, V. V. Nesvizhevsky, S. Reynaud and A. Yu. Voronin Eur. Phys. J. C, 74 1 (2014) 2731 Published online: 30 January 2014 DOI: 10.1140/epjc/s10052-014-2731-8