Opening angle and width as function of deprojected distance z for four rotational H₂ transitions. Top: flow FWHM as function of z for each transition. The straight line fits used to correct the opening angle formula (Equation B.1) are indicated with dashed lines. Bottom: outflow opening angles θ_FWH_M spanned by the FWHM of the flow intensity profile as function of z for each transition. Straight line fits to the data for each transition are shown to guide the eye.