We thank Dr. Pierre Dubath for his help with the INTER-TACOS software used for the reduction of echelle spectra, and Dr. Laura Fullton for providing us with Dr. Sneden's ftp address from which we downloaded the MOOG code. PN thanks Dr. Georges Meynet for a fruitful discussion. This work was supported in part by the Swiss National Science Foundation.
© European Southern Observatory (ESO) 2000
Online publication: August 17, 2000