A reliable activity proxy in SPIRou spectra of M dwarfs using machine learning

Open Access

Fig. 14

W₁ signal of Gl 410 and its periodogram before (red) and after (blue) our filtering technique. For this star, the periodogram of the filtered W₁ has been obtained by removing a cubic trend (the blue full line). The original periodogram of the filtered data is still visible (dotted line).

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