Selection of potential ICGCs around NGC 1399 (first row) and NGC 1374 (second row). Left panel: GC distribution within 5r_eff (dashed blue circle). The radius of 2r_eff is indicated as a dashed red circle. Middle panel: distribution of GCs in projected phase space. Red dots show the galactic GCs within 2r_eff, and black dots show the defined ICGCs. Dashed vertical red and blue lines indicate 2r_eff and 5r_eff, and the grey horizontal lines give the 1 and 2σ scatter of GC velocities within 2r_eff around the systemic velocity of NGC 1374. Right panel: velocity histograms of ICGCs (black) and galactic GCs (red). The dashed black line marks the LOS velocity of NGC 1374, and the dashed grey lines show the 1 and 2σ scatter of GC radial velocities, as also shown in the middle panel.