Upper panel: radial velocity variations of the XO-2N star in correspondence to the transit of the exoplanet XO-2Nb occurred on the night between 4 and 5 December, 2012. Data are folded according to the transit ephemeris derived in this study [Tc = 2455, 565.546480 + N*2.6158592 BJD TDB], and superposed is our best-fit RML model (red line). Lower panel: the χ2 map in the λ − VsinI⋆ parameter space.
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