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Table 2

Overview of the archival M-dwarf spectra used in this work, obtained using the HARPS-south instrument.

Name Spectral type PID (ESO) PI

Proxima Centauri M6.0V 183.C-0437(A) Bonfils
GJ402 M5.0V 183.C-0437(A) Bonfils
GJ9066 M4.5V 072.C-0488(E) Mayor
GJ876 M5.0V 183.C-0437(A) Bonfils
Barnard’s star M4.0V 072.C-0488(E) Mayor

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