An atmospheric signal centred at non-zero radial velocities indicates a motion of the absorber in the planet rest frame, typically due to winds 16 . The blueshifted signal is highly significant compared to the absence of a signal (0±49 ppm) observed at the same time around 0 km s -1 at the 9-σ confidence level (628 ppm / (49 ppm √2) ≈ 9σ).
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