Multi-channel coronal hole detection with convolutional neural networks R. Jarolim, A. M. Veronig, S. Hofmeister, S. G. Heinemann, M. Temmer, T. Podladchikova and K. Dissauer A&A, 652 (2021) A13 Published online: 04 August 2021 DOI: 10.1051/0004-6361/202140640