fp t46,
   t50,
   t49,
   t48,
   t47,
   t43;
      t46 = RATIONAL(1.0,3.0)*y;
      t50 = RATIONAL(1.0,4.0)*x+t46;
      t49 = RATIONAL(-1.0,4.0)*x+t46;
      t48 = RATIONAL(1.0,6.0);
      t47 = RATIONAL(-1.0,6.0);
      t43 = RATIONAL(-2.0,3.0)*y;
      coeff_dy_m1_m1 = t47+t50;
      coeff_dy_0_m1 = t47+t46;
      coeff_dy_p1_m1 = t47+t49;
      coeff_dy_m1_0 = t43;
      coeff_dy_0_0 = t43;
      coeff_dy_p1_0 = t43;
      coeff_dy_m1_p1 = t48+t49;
      coeff_dy_0_p1 = t46+t48;
      coeff_dy_p1_p1 = t48+t50;