A zero order study of the effect of resonances on fast ions measured by FILD in ASDEX Upgrade. - Zestanakis, P A; Anastassiou, G; Rueda-Rueda, J; Galdon-Quiroga, J; Kominis, Y; Upgrade Team, the ASDEX; Tokamak Exploitation Team, the EUROfusion (Plasma Physics & Controlled Fusion, 2025)