Streamlines (initialized from the same starting point) overlaid on the spatial distribution of σ_tor/Γ² for all simulation runs. This ratio serves as a local diagnostic for the onset of centrifugal instability, with low values marking regions where the jet is most susceptible to curvature-driven perturbations. In the widest jets (e.g., Case D_0.1), outer streamlines would likely reach regions satisfying the CFI criterion; here we show a representative streamline to illustrate the overall trend.