Three-dimensional radial distributions of the mass (upper panel), age (middle panel), and metallicity (lower panel) of stars with circularity parameters satisfying ϵ_* > 0.5 (blue lines) ϵ_* < −0.5 (red lines) for G11 at z = 0.5 (epoch &#Xtextcircled;d). We also plot at the top the corresponding scale with respect to the effective radius. Shaded areas indicate the dispersion. Epoch &#Xtextcircled;d happens 1.2 Gyr after the total removal of the pre-existing disk at &#Xtextcircled;c. During this time, the star formation is very low, and the new stars mainly formed at the interface of the inner disk and the new accreted one. This explains the “V-shape” seen in the distribution of the stellar age of counter-rotating stars within 5 kpc.