  We present measurements of the abundances of chromium, cobalt, and nickel in
4113 red giants, including 2277 stars in globular clusters, 1820 stars in the
Milky Way's dwarf satellite galaxies, and 16 field stars. We measured the
abundances from mostly archival Keck/DEIMOS medium-resolution spectroscopy with
a resolving power of R ~ 6500 and a wavelength range of approximately 6500-9000
A. The abundances were determined by fitting spectral regions that contain
absorption lines of the elements under consideration. We used estimates of
temperature, surface gravity, and metallicity that we previously determined
from the same spectra. We estimated systematic error by examining the
dispersion of abundances within mono-metallic globular clusters. The median
uncertainties for [Cr/Fe], [Co/Fe], and [Ni/Fe] are 0.20, 0.20, and 0.13,
respectively. Finally, we validated our estimations of uncertainty through
duplicate measurements, and we evaluated the accuracy and precision of our
measurements through comparison to high-resolution spectroscopic measurements
of the same stars.
