Left: position–velocity diagram from our NOEMA maps of ¹²CO J = 2–1 in AC Her along the direction PA = 136.1°, corresponding to the nebula equator. The contour spacing is logarithmic: ±9, 18, 36, 76, and 144 mJy beam⁻¹ with a maximum emission peak of 230 mJy beam⁻¹. The dashedlines show the approximate central position and systemic velocity. Right: same as in left but along the perpendicular direction PA = 46.1°.