Residual velocity fields obtained after subtracting the velocity field computed from the ITM model data cube (left PUMA, right GHASP). The model, based on a solid-body rotation, is shown in the inset. The purple parallel lines show the isovelocity contours of the edge-on rotating disc model. The bullet and the cross indicate the position of the photometric and kinematical centre, respectively. The arrow indicates the wind direction as derived from the models of Vollmer et al. (2012, 2021).