Fig. 4.

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Differences in vrad obtained for stars in common between MERC and NOT1 (top panel), MERC and CAH2 (top central panel), NOT1 and CAH2 (bottom central panel), NOT2 and MERC (blue), and CAH2 (red), respectively (bottom panel). The error bars are the sum of the square of the uncertainties. In most of the cases, error bars are smaller than symbol sizes.
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