First of all you should load the grid-status-file to see the computed piece of the surface. This piece is bounded by one planar geodesic line, one straight line and an other line which contains a point where 180-degree rotation around the normal of the surface is a symmetry. Now you have to find the point with rotational symmetry. After this normal-rotation reflect the surface along the planar geodesic line, and rotate around the straight line. If you read in the patch-status-file, you will see the fundamental domain of translation of this surface. You can continue it by rotation around the straight lines.