Precise reddening and metallicity of NGC 6752 from FLAMES spectra R. G. Gratton, A. Bragaglia, E. Carretta, F. De Angeli, S. Lucatello, Y. Momany, G. Piotto and A. Recio Blanco A&A, 442 3 (2005) 947 Published online: 14 October 2005 DOI: 10.1051/0004-6361:20053019e