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Fig. 5

image

S/N of individual spectra of RV standards for the RV zero point calibration. There are between 2 and 20 spectra per star, typically 10. The UVES setup used is 580 (see Table 1) and the GIRAFFE setups are HR9B, HR10, 15N, and 21. The very high S/N are due to the RV standard brightness (see Table 3) and to the need of integrating for relatively long exposure times to average out illumination non-homogeneities within the fibers.

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