Observational indications of magneto-optical effects in the scattering polarization wings of the Ca I 4227 Å lineEmilia Capozzi, Ernest Alsina Ballester, Luca Belluzzi, Michele Bianda, Sajal Kumar Dhara and Renzo RamelliA&A, 641 (2020) A63DOI: https://doi.org/10.1051/0004-6361/202038455