Example of the experiment fitting one velocity component (top) and two velocity components (bottom). The red points represent the centroid velocity value of the output models. The solid blue line shows the centroid velocity of the input model, while the dashed blue lines represent the range of the associated error. The error values increase as the S/N decreases. The discrepancy between the centroid velocity values of the output models and the input model increases as the S/N decreases, as we expected.