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Observational and modeling efforts are required to fully understand their physics and to investigate the effects of metallicity in their cool atmospheres.\n  Aims. We perform a detailed study of a sample of subdwarfs to determine their stellar parameters and constrain the stat-of-the art atmospheric models.\n  Methods. We present UVES/VLT high resolution spectra of three late-K subdwarfs and 18 M subdwarfs. 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