Position-velocity plots of the ¹³CO J = 2 → 1 line. Slices are traced (a) from northeast (+40″, +40″) to southwest (−40″, −40″); and (b) from southeast (+40″, −40″) to northwest (−40″, +40″). Contour levels are 0.6, 0.75, 0.9, 1.2, 1.5, 2.0, 2.5, 3.0, and 3.5 K km s⁻¹. Vertical yellow lines mark the approximate extension of the IR dust nebula. In plot a the three components are clearly noted, with component C and part of the component A positioned just outside the nebula. In plot b, component C is not present and component B is concentrated on the nebula.