Hydrogen column density variability in a sample of local Compton-thin AGN N. Torres-Albà, S. Marchesi, X. Zhao, I. Cox, A. Pizzetti, D. Sengupta, M. Ajello and R. Silver A&A, 678 (2023) A154 Published online: 18 October 2023 DOI: 10.1051/0004-6361/202345947