Based on
observations collected at the La Silla Observatory, ESO (Chile),
with the CORALIE spectrograph at the 1.2 m
Euler Swiss telescope, and with the FEROS spectrograph
at the 1.52 m ESO telescope, and using the UES
spectrograph at the 4.2 m William Herschel Telescope (WHT) and SARG
spectrograph at the 3.5 m Telescopio Nazional Galileo
on La Palma (Canary Islands).
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