Table 2: Instrument and spectra general characteristics.
Observatory/tel spectrograph size CCD pixel size grating dispersion spectral coverage width slit resolution lenght slit

(pixels) ( $\mu$ m²) (grooves mm^-1) (Å/pixel) (Å) ( $^{\prime\prime})$ (Å) ( $^{\prime}$ )

ESO 1.52 m B&C 2688 $\times$ 512 15 $\times$ 15 300 3.72 3600-10 100 3.5 18 4.1

CASLEO 2.15 m B&C 1024 $\times$ 1024 24 $\times$ 24 300 3.43 3600-6800 4.0 14 4.7

**Table 2:** Instrument and spectra general characteristics.
Observatory/tel	spectrograph	size CCD	pixel size	grating	dispersion	spectral coverage	width slit	resolution	lenght slit
		(pixels)	( $\mu$ m²)	(grooves mm^-1)	(Å/pixel)	(Å)	( $^{\prime\prime})$	(Å)	( $^{\prime}$ )
ESO 1.52 m	B&C	2688 $\times$ 512	15 $\times$ 15	300	3.72	3600-10 100	3.5	18	4.1
CASLEO 2.15 m	B&C	1024 $\times$ 1024	24 $\times$ 24	300	3.43	3600-6800	4.0	14	4.7

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