Investigating ULX accretion flows and cyclotron resonance in NGC 300 ULX1 F. Koliopanos, G. Vasilopoulos, J. Buchner, C. Maitra and F. Haberl A&A, 621 (2019) A118 Published online: 21 January 2019 DOI: 10.1051/0004-6361/201834144