NuSTAR spectral analysis of three Seyfert galaxies: NGC 3227, NGC 5548, and MR 2251−178 I. Pal, C. S. Stalin, L. Mallick and P. Rani A&A, 662 (2022) A78 Published online: 21 June 2022 DOI: 10.1051/0004-6361/202142386