Examples of GIRAFFE spectra and the fits provided by some of the Nodes. Each column of panels contains the data for a single star as analysed by one of the Nodes (see labels at the top of the columns). Each row of panels shows a specific GIRAFFE setup. In some cases setups were not observed or were not included in the analysis of a specific Node. The black line shows the observed spectrum, the red line the best fit. The IAC Node only fitted selected hydrogen and helium lines. For the ON Node a full theoretical spectrum is plotted, but only the spectral lines indicated with tick marks were used in the χ² calculation and the abundance determination. Some of the HR05A spectra show a prominent diffuse interstellar band at 4430 Å. Insets for the Liège Node show the fit of specific lines that were used for abundance determination.