On-sky performance of the QACITS pointing control technique with the Keck/NIRC2 vortex coronagraphE. Huby, M. Bottom, B. Femenia, H. Ngo, D. Mawet, E. Serabyn and O. AbsilA&A, 600 (2017) A46DOI: https://doi.org/10.1051/0004-6361/201630232