NEUTRALUNIVERSEMACHINE: Predictions of H I gas in different theoretical models Lingkun Wen, Hong Guo, Wenlin Ma, Lizhi Xie, Gabriella De Lucia, Fabio Fontanot and Michaela Hirschmann A&A, 699 (2025) A14 Published online: 30 June 2025 DOI: 10.1051/0004-6361/202452697