Influence of the mass-loading parameter κ on the final stage of jets obtained with α = 3/4. The color background is the logarithm of the FM Mach number n, black solid lines are field lines, yellow lines are isocontours of the electric current rB_ϕ and the red dashed (resp. dotted) curve is the FM (resp. Alfvén) critical surface. The left panels show the whole domain and the right panels a close-up view around the shock-formation regions. In the left panel, the field lines anchoring radii are r_o = 3; 15; 40; 80; 160; 320; 600; 1000; 1500. In the right panel, the field lines anchoring radii are r_o = 1.2; 2; 3; 4; 5; 7; 9; 11; 13; 15.