Mode analysis limitations of ECE-I & ECE measurements at the plasma edge B. Vanovac, S.S. Denk, E. Wolfrum, M. Willensdorfer, W. Suttrop, R. Fischer, N.C. Luhmann Jr and ASDEX Upgrade Team EPJ Web Conf., 203 (2019) 02011 Published online: 25 March 2019 DOI: 10.1051/epjconf/201920302011