Performance of the X-Calibur hard X-ray polarimetry mission during its 2018/19 long-duration balloon flight. - Abarr, Q.; Beheshtipour, B.; Beilicke, M.; Bose, R.; Braun, D.; de Geronimo, G.; Dowkontt, P.; Errando, M.; Gadson, T.; Guarino, V.; Heatwole, S.; Hossen, M.; et al. (Astroparticle Physics, 2022)