Relation between orbital eccentricity and [Fe/H] for the in situ (first row), accreted (second row), and the five most significant merger debris (third through sixth rows). For improved visibility, the density maps are normalized in each metallicity bin. Stars with negative angular momentum have negative values for eccentricity. In other words, the stars above the pink line in each panel are counter-rotating. Although the eccentricity distribution of accreted stars shows a complex behaviour, the individual merger debris have nearly constant eccentricity as a function of [Fe/H]. The features of the in situ stars are linked to the merger events that heat up the disc and, thus, increase the eccentricity of the pre-existing populations.