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Table 2

RV offsets between instruments derived for stars in common.

Instruments Ncommon N Offset
a (m s-1)

CORALIE−SOPHIE 164 154 –23 ± 2.4
NARVAL−SOPHIE 114 108 –26 ± 6.2
HARPS−SOPHIE 36 34 17 ± 5.0
HARPS−CORALIE 88 84 31 ± 1.5



N is the number of stars effectively used after an iterative clipping at a 3σ level.


In the case of ELODIE−SOPHIE a linear regression was performed, giving an offset as a function of the colour index Offset = − 259.0(B − V) + 105.2 ± 2.9 m s-1.

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