Selection of GSE stellar samples using different criteria. In the top and central panel, the dynamical space (energy versus angular momentum) is represented, showing the whole halo stars sample in grey, and the GSE samples in green. All dynamical co-ordinates in this plot are calculated using D23 prescriptions for the MW potential and the position and motion of the Sun, to allow for a direct comparison. The corresponding CMDs are shown in the bottom panel. From left to right in decreasing order of number of stars.