Dark and bright sides of the Broad Line Region clouds as seen in the FeII emission of SDSS RM 102 Alberto Floris, Ashwani Pandey, Bozena Czerny, Mary Loli Martinez Aldama, Swayamtrupta Panda, Paola Marziani and Raj Prince A&A, 697 (2025) A23 Published online: 30 April 2025 DOI: 10.1051/0004-6361/202452067