Distribution of the median S/N per pixel of the spectra observed with UVES that are part of iDR2 (1412 FGK-type stars). Each of the two UVES spectrum parts (from each CCD) is counted separately (thus, two spectra per star). The red dashed line indicates S/N = 20. The samples of the solar neighborhood (GES_MW), open clusters (GES_CL), and calibration targets (GES_SD) are shown separately. Only final stacked spectra were included in this plot; the single exposure spectra, even when analyzed, are not counted.