Mass accretion rates of clusters of galaxies: CIRS and HeCS M. Pizzardo, S. Di Gioia, A. Diaferio, C. De Boni, A. L. Serra, M. J. Geller, J. Sohn, K. Rines and M. Baldi A&A, 646 (2021) A105 Published online: 16 February 2021 DOI: 10.1051/0004-6361/202038481