Kinematic and spatial distribution of member candidates (Coma Ber: red; group-X: blue). Members from previous studies are in open circles (Odenkirchen et al. 1998: green; Tang et al. 2018: dark red; Oh et al. 2017's group 10: orange; Oh et al. 2017's group 81: gray; Oh et al. 2017's group 1805: pink). Panels (a) and (b) show the 3D spatial position of member candidates in Galactocentric Cartesian X, Y, Z coordinates. The gray arrow in (a) and (b) is the orbit motion of Coma Ber. Panel (c) is the same as (a), but with the symbols color-coded and sizes adjusted to reflect the M_G magnitude. Bright stars are bigger and have darker color. The purple circle shows the region within the tidal radius (6.9 pc, see Section 4.3) of Coma Ber. The big gray arrow is the projected mean velocity vector of Coma Ber relative to LSR. Panel (d) shows the proper motion vector plot with purple dots as the Come Ber member candidates within the tidal radius. Panel (e) shows the RV histogram.