Position-velocity (PV) cuts of the H30α line along the direction of the equator (PA = 45°) at different δx offsets (δx = −0.′′046, δx = −0.′′023, δx = 0′′, δx = +0.′′023, and δx = +0.′′046). The dashed lines show the position and velocity of the red and blue emission peaks at offset δx = 0′′. Offset δy = 0 is indicatedby the white dotted line. The signature of rotation is very clear even at the largest offsets. Levels are 3.5 × 1.5ⁱ (i = 1,2,3,...) mJy beam⁻¹; the units of the wedge are mJy beam⁻¹.