Representative channel maps from the observed data cube of NGC 4217 and the different models of the main disk. Contour levels are −1.5, 1.5 (1.5σ,) and 8.0 mJy beam^-1. The black contours show the observations, with negative contours as dashed grey. The green contours represent the final (B) model. Other models are shown as red contours. The systemic velocity is 1022 ± 6 km s^-1. The arrows highlight regions where the B model is significantly thicker than the observed emission, as explained in the text.