Regions defined for the column density estimates of the three velocity components sketched as polygons in white. Lines, velocity intervals of integration, first contours, and spacing are: (a) ¹³CO J = 2 → 1, 35.4 to 37.0 km s⁻¹, 3 K km s⁻¹, and 0.4 K km s⁻¹; (b) CO J = 2 → 1, 47.6 to 49.1 km s⁻¹, 1.4 K km s⁻¹, and 0.7 K km s⁻¹; (c) ¹³CO J = 2 → 1, 69.6–70.7 km s⁻¹, 0.3 K km s⁻¹, and 0.3 K km s⁻¹. The HPBW is shown near the bottom-left corner of panel a.