A study of C4H3N isomers in TMC-1: Line by line detection of HCCCH2CN N. Marcelino, B. Tercero, M. Agúndez and J. Cernicharo A&A, 646 (2021) L9 Published online: 12 February 2021 DOI: 10.1051/0004-6361/202040177