Forces in the transfield direction along the boundary streamlines for solutions GRBId, GRBRes1, and GRBRes2. Left panel: Thermal pressure gradient. Right panel: Lorentz force. The thermal collimating force is intensified in both resistive solutions, while the force due to the electromagnetic field becomes negative and collimates the jet shortly after r_η, denoted by the red vertical dashed line. The dashed parts of the curves correspond to negative values of the forces.