Activity–rotation in the dM4 star Gl 729 - A possible chromospheric cycle R. V. Ibañez Bustos, A. P. Buccino, S. Messina, A. F. Lanza and P. J. D. Mauas A&A, 644 (2020) A2 Published online: 24 November 2020 DOI: 10.1051/0004-6361/202039164