fp coeff_dxz_m1_m1_m1,
   coeff_dxz_0_m1_m1,
   coeff_dxz_p1_m1_m1,
   coeff_dxz_m1_0_m1,
   coeff_dxz_0_0_m1,
   coeff_dxz_p1_0_m1,
   coeff_dxz_m1_p1_m1,
   coeff_dxz_0_p1_m1,
   coeff_dxz_p1_p1_m1,
   coeff_dxz_m1_m1_0,
   coeff_dxz_0_m1_0,
   coeff_dxz_p1_m1_0,
   coeff_dxz_m1_0_0,
   coeff_dxz_0_0_0,
   coeff_dxz_p1_0_0,
   coeff_dxz_m1_p1_0,
   coeff_dxz_0_p1_0,
   coeff_dxz_p1_p1_0,
   coeff_dxz_m1_m1_p1,
   coeff_dxz_0_m1_p1,
   coeff_dxz_p1_m1_p1,
   coeff_dxz_m1_0_p1,
   coeff_dxz_0_0_p1,
   coeff_dxz_p1_0_p1,
   coeff_dxz_m1_p1_p1,
   coeff_dxz_0_p1_p1,
   coeff_dxz_p1_p1_p1;