Treatment of an overshoot in the downwind interval OP by three different methods. Black solid line: BESSER implementation with continuous derivative at point O and the c_P overshoot correction of the control point. Crosses: piecewise monotonic quadratic Bézier spline interpolation. Solid gray line: parabolic interpolation. We note that the piecewise monotonic quadratic Bézier interpolation coincides with the parabolic interpolation in the MO segment because the overshoot in the OP interval does not affect the upwind interpolation between M and O.