Fig. 3: Outflow properties derived from the PV diagrams of three molecular lines.

a Outflow radius. The open symbols represent the outflow radius at z_proj = 0, R_0,geom, estimated from parabolic fitting to the measured outflow radii for each molecule. The associated error bars indicate the 1σ uncertainties of the R_0,geom derived from the covariance matrix of the parabolic fit. b Rotation velocity. c Specific angular momentum, j = R_outflow × v_ϕ. d Axial velocity. e Radial expansion velocity. f Poloidal (or outflowing) velocity. The red, orange, and blue markers represent the outflow properties derived from the H₂CO, CH₃OH, and SO molecular lines, respectively. Error bars represent the 1σ statistical uncertainties propagated from the bootstrap-derived ellipse-fitting parameters. For the axial and poloidal velocities, which are particularly sensitive to the nearly edge-on geometry, the effect of inclination is illustrated by showing values computed for i = 83^∘ and 87^∘, indicated by circle and triangle symbols, respectively. These values bracket the estimated inclination uncertainty of \(8{5}_{-2}^{+2\circ }\).