Toward a characterization of X-ray galaxy clusters for cosmology Florian Käfer, Alexis Finoguenov, Dominique Eckert, Jeremy S. Sanders, Thomas H. Reiprich and Kirpal Nandra A&A, 628 (2019) A43 Published online: 06 August 2019 DOI: 10.1051/0004-6361/201935124