Moment 1 and Moment 2 of the G323.18+0.15 complex, and PV diagram along its filamentary structure. Top: color backgrounds in the left and right panels are velocity field and velocity dispersion of ¹³CO (J = 2−1). The white contours denote ¹³CO emission integrated from −69 to −61 km s⁻¹, which starts from 2 Kkm s⁻¹ (signal weaker than 3σ is masked out) and increases in steps of 9 Kkm s⁻¹. Bottom: position-velocity diagram of the ¹³CO(J = 2−1) emission along the direction labeled by the red line in the top panel. The vertical dotted black line represents the position that is plotted as small red circles in the top panel. The horizontal dotted black lines represent the system velocities of G323.18a and G323.18b. The black contours start at 3 K and increase in steps of 0.9 K.