Left column: First-moment map of the CO observations for NGC 1512 (top), NGC 4535 (middle), and NGC 7496 (bottom). The black ring indicates the outermost radius that was used for the model. The pink line tracks the systemic velocity line. Middle column: First-moment map of the H I model using the best-fit parameters found. Right column: Residual velocity field between the observation and the model. Models and residuals larger than R_max are not shown due to unphysical results as discussed in Section 3 as part of the second run.