title: Comment on "Testing three-body quantum electrodynamics with trapped Ti20+ ions: evidence for a Z-dependent divergence between experiment and calculation".
authors.affiliation: Max Planck Advanced Study Group, Center for Free-Electron Laser Science, 22607 Hamburg, Germany and Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany.
authors.forename: S W
authors.initials: SW
authors.lastname: Epp