Testing and Characterization of Detection Plane Elements of the XGIS Instrument on Board the THESEUS Mission. - Srivastava, Smiriti; Demenev, Evgeny; Labanti, Claudio; Amati, Lorenzo; Campana, Riccardo; Baldazzi, Giuseppe; Borciani, Edoardo; Calabretto, Paolo; Ficorella, Francesco; Marchesini, Ezequiel J.; Mattioli, Giulia; Sharma, Ajay; et al. (Particles (2571-712X), 2026)