Position of programme stars in the Cartesian galactocentric plane. The black points represent the leading and trailing streams in the model by Law & Majewski (2010). Left panel: red stars show RGB stars in leading arm 1 and green stars show RGB stars in leading arm 2. The Galactic plane (dashed line), the position of the Sun, and the Galactic centre are also marked for reference. The blue box and the dashed line will be described in Sect. 3.4.2. Right panel: RGB stars in the trailing stream. Blue stars show RGB stars in trailing arm 1 and pink stars show RGB stars in trailing arm 2. We kept consistent colour for the given structures throughout the manuscript.