Position-velocity diagrams along the major axis of the inner nearly edge-on disk. Left panel: Pv-diagram of the atomic and molecular gas (green contours). H I emission is shown by the colour scale and orange solid contours, while absorption is represented by dashed contours. Contour levels are −5; −3; 3, 5, 6, 12, 24σ. Right panel: Pv-diagram derived from the [N II]λ6583 emission (blue colour scale) overlaid with the H I emission and absorption.