Position–velocity diagrams of NGC 613 for the CO(3–2) emission along the major axis at a PA = 120° (top panel) and minor axis (PA = 210°, bottom). We used a slit width. The blue contours are from 1σ to 64σ, and follow each other by factor-two multiplication. The red dashed lines are the best fit from ^3DBAROLO. The emission around v ∼ 400 km s⁻¹ corresponds to the isotope H¹³CN(4–3).