P-V diagrams of SO₂, OCS, H₂CO, and HCN extracted along a cut perpendicular to the jet axis. For OCS and H₂CO, we fitted the emission using three kinematic models: pink lines represent the infall motion fit, blue lines the Keplerian rotation fit, and green lines the rotating infalling envelope model. The labels give the mass of the central protostar derived from each fit, and the negative offset marks the northwest direction. For SO₂ and HCN, we overlay the model with the average of the fit parameters obtained from the models in OCS and H₂CO for comparison, as their emission is more complicated.