Survival in an extreme environment: Which is the closest globular cluster to the Galactic centre?D. Minniti, J. G. Fernández-Trincado, L. C. Smith, P. W. Lucas, M. Gómez and J. B. PullenA&A, 648 (2021) A86DOI: https://doi.org/10.1051/0004-6361/202039820