Fig. 18
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Periodograms of RV residuals (top row), SPIRou ancillary LBL data (next three rows), longitudinal magnetic field, and spectral window (bottom row) for GJ 1148. The red zone shows the estimated rotation period (Díez Alonso et al. 2019) and its 3σ range; the first two harmonics of this rotation period are also shown as dotted lines.
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