Precision mass measurements in the zirconium region pin down the mass surface across the neutron midshell at N = 66. - Hukkanen, M.; Ryssens, W.; Ascher, P.; Bender, M.; Eronen, T.; Grévy, S.; Kankainen, A.; Stryjczyk, M.; Beliuskina, O.; Ge, Z.; Geldhof, S.; Gerbaux, M.; et al. (Physics Letters B, 2024)