The hot interstellar medium towards 4U 1820-30: a Bayesian analysis D. Rogantini, E. Costantini, M. Mehdipour, L. Kuiper, P. Ranalli and L. B. F. M. Waters A&A, 645 (2021) A98 Published online: 20 January 2021 DOI: 10.1051/0004-6361/202037773