Integrated intensity map and the channel maps of C¹⁸O. The color scale units are K km s⁻¹. The integrated intensity map is shown in the upper-right panel, and the velocity range is 5.8 to 8.5 km s⁻¹ in v_LSR. The center LSR velocity of each channel map is shown on the top of each panel. The contours overlaid on all panels represent the Herschel H₂ column density map, the levels of which are 1.5 × 10²² cm⁻², 3.5 × 10²² cm⁻², and 5.5 × 10²² cm⁻². (Color online)