Comparison of our Zn measurements with those from the literature. Errorbars show the combined uncertainties of both measurements. Downward pointing violet triangles are stars from Shetrone et al. (2003) and orange triangles are stars from Hill et al. (in prep.). The panels show differences of: a) the measured EW of the Zn line at 4810.5 Å, between the literature and this work, in all cases using the same UVES spectra; b) the [Zn/Fe] measurements, between the literature and this work, in all cases using the same UVES spectra; c) the [Zn/Fe] measurements from the GIRAFFE HR7A and UVES spectra, as measured by this work.