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\section{Datasets}  While various very-high ($\lambda/\delta\lambda>50\,000$) resolution spectrographs covering most or all of the near-infrared domain at once are currently under design or construction (e.g., Carmenes, SPIRou, PRVS), none is currently in operation. As a result, very-high resolution spectra available in archives only cover relatively short wavelength intervals. The only publicly available spectrum of an M dwarf at a resolution sufficient to resolve the intrinsic stellar line width ($\sim5\,km/s$ or $\lambda/\delta\lambda>60\,000$) is that available through the CRIRE-POP\footnote{http://www.univie.ac.at/crirespop/} spectral library for the Barnard star ({\color{red} refcrirespop}). These observations cover the $Y$, $J$, $H$, $K_s$, $L$ and $M$ bands; of specific interest here being the $\lt 2.38\mu$m domain that is amenable to m/s-level accuracy velocimetry. As the sole M dwarf with complete near-infrared coverage at this resolution, Barnard's Star is a relatively convenient choice as, with an M4.0V spectral type it is representative of field M dwarfs that will be targeted by upcoming near-infrared radial-velocity surveys. For earlier M dwarfs, optical spectrographs are competitive against near-infrared spectrographs. Vert late M dwarfs ($\gt$M7V) are even more promising targets for nIR velocimetry, but are generally fast rotators, even at ages of Gyr {\color{red} refxavier}. Furthermore, the rotation period of Barnard's star is known to be very long (130.4\,days; {\color{red} http://arxiv.org/pdf/astro-ph/9806276v1.pdf}). With a interferometrically determined radius of $0.196\pm0.008$ {\color{red}(http://arxiv.org/pdf/0906.0602v1.pdf)}, the rotational broadening is $\lt76$\,m/s. This value is about two orders of magnitudes smaller than the intrinsic line width of M dwarfs. The only peculiarity regarding Barnard's star relative to the bulk of field star is that it is a metal-poor thick disk star. This affects the radial velocity content of its spectrum. This is addressed in section~\ref{metalvsq} section~\ref{metallicityQ}   
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