Ba and Eu abundance diagrams for the GE-dominated group. In grey, the whole sample of metal-poor stars is shown. Black crosses are stars of the GE-dominated group that were found to be of in situ origin and high values of [Al/Fe]. The green symbols are the remaining stars of the group. Top left: [Ba/Eu] as a function of [Fe/H]. Dashed lines indicate the solar ratio, and the values for pure contributions for the s- and r-processes were calculated by Bisterzo et al. (2014). The horizontal lines on the kernel density estimate (KDE) plot mark the peak values. Top right: [Eu/Ba] as a function of [Eu/Fe]. The limits of [Eu/Fe] for defining the r-I and r-II stars proposed by Beers & Christlieb (2005) are indicated. Bottom left: [Eu/Fe] as a function of [Fe/H]. Bottom right: [Eu/Mg] as a function of [Fe/H]. The green line and the green stripe show the running mean and the scatter, respectively.