Testing the flux tube expansion factor - solar wind speed relation with Solar Orbiter data J.-B. Dakeyo, A. P. Rouillard, V. Réville, P. Démoulin, M. Maksimovic, A. Chapiron, R. F. Pinto and P. Louarn A&A, 691 (2024) A77 Published online: 29 October 2024 DOI: 10.1051/0004-6361/202451272