fp t52,
   t51;
      t52 = RATIONAL(-2.0,3.0);
      t51 = RATIONAL(1.0,3.0);
      coeff_dxx_m1_m1 = t51;
      coeff_dxx_0_m1 = t52;
      coeff_dxx_p1_m1 = t51;
      coeff_dxx_m1_0 = t51;
      coeff_dxx_0_0 = t52;
      coeff_dxx_p1_0 = t51;
      coeff_dxx_m1_p1 = t51;
      coeff_dxx_0_p1 = t52;
      coeff_dxx_p1_p1 = t51;