Soo, John Y. H. ; Joachimi, Benjamin; Eriksen, Martin; Siudek, Malgorzata; Alarcon, Alex; Cabayol, Laura; Carretero, Jorge; Casas, Ricard; Castander, Francisco J.; Garca-Bellido, Juan The PAU Survey: narrowband photometric redshifts using Gaussian processesMonthly Notices of the Royal Astronomical Society(2021)