The polarimetric response of the Nançay Radio Telescope and its impact on precision pulsar timing Lucas Guillemot, Willem van Straten, Ismaël Cognard, Aurélien Chalumeau, Gilles Theureau and Éric Gérard A&A, 699 (2025) A104 Published online: 10 July 2025 DOI: 10.1051/0004-6361/202553929