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NAHUAL is an infrared high-resolution echelle spectrograph for the Gran Telescopio CANARIAS (GTC) of the Observatorio del Roque de los Muchachos in the island of La Palma. The main scientific objective of the instrument is to measure the radial velocity (RV) with very high precision (goal of 1 m/s) in the near infrared. This will facilitate the detection of exoplanets of low mass (possibly of rocky type) around cool stars and brown dwarfs with spectral types K, M and L (M-type stars are the most numerous in the solar vicinity and in the Milky Way).

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