Sketch of the two scenarios of the disk and the outflow of NGC 3690-A. The disk is coloured in a gradient from red to blue, which represents the motion away or towards the observer, respectively. In the leading scenario (left) the observer sees the southern part of the disk, while in the trailing scenario (right) the observer sees the northern part. The schematic shape of the spiral arms observed in the optical and near-IR (see Randriamanakoto et al. 2019) is shown in light green.