d. In the syntax
                  descriptions below, items delimited by brackets
                  are optional.

                  [1,c1] = size(method); char = class(method)

                     or

                  [1,1] = size(method); cell = class(method)

                  `method' may be assigned the following values:

                     'ELLIPSOID'

                        The normal vector computation uses a triaxial
                        ellipsoid to model the surface of the target
       