The next stage adds the two new curves to the X-Topology Surface.
71. Select both the vertical and horizontal curves within the grid square.
72. Add the curves to the existing surface using the multi-select options on the Right-Click menu, (Right-Click -> Multiple Selection -> Insert into Surface -> XTSurface1).
73. The two curves should now be incorporated into the surface as shown in the image below.
Continuity and Curvature of a X-Topology Surface >>>