Examples of stream motions recovered by BEACON in the observational data of Leo I. Left panels: positions of all observed stars as small black points. The coloured points are the stars BEACON joins to a stream detection; the colour represents the radial velocity measured for each star. The direction of the projected angular momentum of this stream is shown as a black arrow. Middle panels: radial velocity of the stars belonging to the stream as a function of their distance to the centre of the dwarf galaxy. Right panels: Metallicity distribution of the whole sample (red) and the metallicity distribution of the stars from the stream recovered by BEACON (black).