      t0 = -2.D0/15.D0/R**2*M*sqrt(6.D0)*sqrt(pi)
                                dxC11(1,1)=t0

      t0 = cmplx(0.D0,4.D0/15.D0)/R**2*M*sqrt(6.D0)*sqrt(pi)
                                dxC11(1,2)=t0

      t0 = 0
                                dxC11(1,3)=t0

      t0 = 0
                                dxC11(1,4)=t0

      t0 = 2.D0/5.D0/R**2*M*sqrt(6.D0)*sqrt(pi)
                                dxC11(2,2)=t0

      t0 = 0
                                dxC11(2,3)=t0

      t0 = 0
                                dxC11(2,4)=t0

      t0 = 2.D0/5.D0/R**2*M*sqrt(6.D0)*sqrt(pi)
                                dxC11(3,3)=t0

      t0 = 0
                                dxC11(3,4)=t0

      t0 = 2.D0/3.D0/R**2*M*sqrt(6.D0)*sqrt(pi)
                                dxC11(4,4)=t0

