ELT-scale elongated LGS wavefront sensing: on-sky results Lisa Bardou, Éric Gendron, Gérard Rousset, Damien Gratadour, Alastair Basden, Domenico Bonaccini Calia, Tristant Buey, Mauro Centrone, Fanny Chemla, Jean-Luc Gach et al. (9 more) A&A, 649 (2021) A158 Published online: 01 June 2021 DOI: 10.1051/0004-6361/202038330