Precise reddening and metallicity of NGC 6752 from FLAMES spectra R. G. Gratton, A. Bragaglia, E. Carretta, F. De Angeli, S. Lucatello, G. Piotto and A. Recio Blanco A&A, 440 3 (2005) 901-908 Published online: 05 September 2005 DOI: 10.1051/0004-6361:20053019