Angular momentum per unit of stellar mass for different streams. Left panel: different angular momentum patterns recovered by BEACON in the 14 streams of the sample of 953 stars from Leo I, coloured according to their [Fe/H]. Middle panel: angular momentum for a simulation of the dissolving star cluster model with 16 star clusters dissolved. Circles have radius from 0 pc² s⁻¹ to 3 × 10³ pc² s⁻¹ with step of 0.5 × 10³ pc² s⁻¹ for each dotted concentric circle. Right panel: angular momentum of the streams recovered by BEACON in a tidal stirring simulation. There is no net rotation signal in the Leo I observational data and in the dissolving star cluster model, while in the tidal stirring model the angular momentum vectors point in roughly the same direction, suggesting a remnant rotation signal.