A 'linear' Horner surface of the fourth degree [Une surface de Horner 'linéaire' du quatrième degré].

                    pX01=+1.0
                    pX10=+1.0
                    pX20=+1.0
                    pX33=-2.2

                    pY22=-1.0
                    pY01=+1.0
                    pY02=+1.0
                    pY12=+1.0

                    pZ01=+1.0
                    pZ10=+1.0
                    pZ20=+1.0