fp t55,
   t54,
   t53;
      t55 = RATIONAL(0.0,1.0);
      t54 = RATIONAL(1.0,4.0);
      t53 = RATIONAL(-1.0,4.0);
      coeff_dxy_m1_m1 = t54;
      coeff_dxy_0_m1 = t55;
      coeff_dxy_p1_m1 = t53;
      coeff_dxy_m1_0 = t55;
      coeff_dxy_0_0 = t55;
      coeff_dxy_p1_0 = t55;
      coeff_dxy_m1_p1 = t53;
      coeff_dxy_0_p1 = t55;
      coeff_dxy_p1_p1 = t54;