PV slices along the kinematical major (left column) and minor axis (right column) of the 3986 × 3836 resolution data cube of UGCA 105 (greyscale and blue contours) in comparison with the corresponding PV slices through different model cubes (pink contours). Contour levels are 0.9 (2σ), 3.6, 14.4, and 40 mJy beam^-1. The characteristic features of each model are given in the top right corner of the respective panels (DVRO: vertical gradient of rotation velocity, DVRA: vertical gradient of radial velocity, Vrad: radial velocity, ZDRO: onset height for vertical gradient of rotation velocity, ZDRA: onset height for vertical gradient of radial velocity; see Sects. 5.1–5.3 for details). The arrow, circles, and ellipses in panel a) denote unusual features in the data, some of which are successfully reproduced by certain models, while others are not (see text for details).