This directory contains data files for X-shooter reference spectra of six selected southern standard stars. The selection of the stars, measurement of their fluxes and comparison to atmospheric models is presented in Moehler et al. 2014, A&A, 568, 9; see also Moehler et al., 2014, The Messenger, 158, 16. The 'f' files list wavelength (Angstrom) and flux (ergs/cm/cm/s/A). The file name consists of a prefix 'f' and the star name. The 'm' files list wavelength (Angstrom) and AB magnitude. The file name consists of a prefix 'm' and the star name. For more details see: http://www.eso.org/sci/observing/tools/standards/spectra/Xshooterspec.html Last update 20 April 2015 by jwalsh and smoehler at eso.org