Measurement for the Euclid-like set-up. Upper right: COSEBI E-modes E_n measured for the original FS2 galaxies (black points), the clustered catalogue (red plusses) and the unclustered catalogue (blue crosses) with the Euclid uncertainty (grey band) for a subset of the 13 tomographic bins. Lower left: Difference between E_n for the original and clustered sources (black points) and between the clustered and unclustered sources (blue crosses), divided by Euclid uncertainty. The full measurement for all tomographic bins is in Fig. E.8.