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Fig. A.1.

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Overdensities’ detection in the simulations, for t = 14 bar laps. They are coloured by their ∂Vϕ/∂R (top panels) and ∂Vϕ/∂ϕ (bottom panels) at each VR. The dashed black boxes represent the region of the velocity distribution associated with Hercules and Hat. Left: SBM detection of the overdensities. Right: FBM detection of the overdensites.

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