  We present spectroscopic data for individual stars observed from 2004 March
through 2008 August as part of our Michigan/MIKE Fiber System (MMFS) survey of
four dwarf spheroidal (dSph) galaxies: Carina, Fornax, Sculptor and Sextans.
Using MMFS at the Magellan/Clay Telescope at Las Campanas Observatory, we have
acquired 8855 spectra from 7103 red giant candidates in these Galactic
satellites. We list measurements of each star's line-of-sight velocity (median
error +/- 2.1 km/s) and spectral line indices for iron and magnesium absorption
features. We use globular cluster spectra to calibrate the indices onto
standard [Fe/H] metallicity scales, but comparison of the resulting
metallicities with published values suggests that the MMFS indices are best
used as indicators of relative, not absolute metallicity. The empirical
distributions of velocity and spectral indices also allow us to quantify the
amount of contamination by foreground stars. In a companion paper we develop an
algorithm that evaluates the membership probability for each star, showing that
the present MMFS sample contains more than 5000 dSph members, including 774
Carina members, 2483 Fornax members, 1365 Sculptor members, and 441 Sextans
members.
