Bow shock 3D paraboloid quadric fits projected on the x − y (top) and x − z (bottom) planes for photoionisation (PI run), photoionisation + electron ionisation (PI+EI run), photoionisation + charge exchange (PI+CX run), and for all processes (PI+CX+EI run). The position of the nucleus is marked as a black cross. The bow shock surface is asymmetric with respect to the z = 0 line in the x − z plane.