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Table 1

Properties of the different spectrographs used in this work.

Spectrograph Spectral range (Å) Resolving power N stars
FEROS 3500–9200 48 000 74
HARPS 3780–6910 115 000 8
SOPHIE 3872–6943 75 000 5
2dcoudé 3400–10 000 60 000 1

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