For model M1: fractional contribution of each of the co-spatial discs along the line of sight in l,b for a snapshot at t = 0 (left) and at 7 Gyr (right, i.e. the same snapshot as the one shown in Fig. 1), where we chose only particles with distances between 4 and 12 kpc from the Sun. At late times (right panel) the cold population, D1, puffs up and has a distinctive peanut shape.
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