Comparison between [Fe/H] determined from EW measurements of the two strongest CaT absorption lines for eight VLT/FLAMES LR8 observations of the same field and the same targets as a function of the S/N of the measurement. The observations were made between July 2014 and October 2015. All [Fe/H] measurements were compared with those from observation B2, which took place on 21 July 2014. In the top of each plot the mean [Fe/H] offset and the variance is given for each comparison; the dashed green line is the mean, and the two dashed red lines on either side show 1σ about this mean.