Featureless transmission spectra of 12 giant exoplanets observed by GTC/OSIRIS C. Jiang, G. Chen, E. Pallé, F. Murgas, H. Parviainen and Y. Ma A&A, 675 (2023) A62 Published online: 04 July 2023 DOI: 10.1051/0004-6361/202346091