Continuum reverberation mapping of the quasar PG 2130+099 C. Fian, D. Chelouche, S. Kaspi, C. Sobrino Figaredo, S. Catalan and T. Lewis A&A, 659 (2022) A13 Published online: 25 February 2022 DOI: 10.1051/0004-6361/202141509