Extended Main-sequence Turnoff as a Common Feature of Milky Way Open Clusters

This work has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme (grant agreement ERC-StG 2016, No. 716082 “GALFOR”; PI: Milone), and the European Union’ Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie (grant Agreement No. 797100, beneficiary: Marino). A.P.M. acknowledges support from MIUR through the FARE project R164RM93XW “SEMPLICE”; A.F.M. has been supported by the Australian Research Council through Discovery Early Career Researcher Award DE160100851.