Λ_⊙ vs. V_gsr diagram for RGB and RHB stars. Upper panel: the dots are ~22 000 RGB stars from SDSS DR9. The red dashed lines indicate the boundaries of the Law & Majewski (2010) model. The upper boundary of trailing arm is fitted in this work and shown by a solid line. The blue dotted and dashed lines are provided by Yanny et al. (2009). The stars with the distance cuts are shown with blue dots for the trailing stream and red dots for the leading stream. Leading arm and trailing arm are also labelled. Lower panel: same as upper panel but for 8535 RHB stars.