find_tetra_order_grid(top, ePBC, natoms, box, x, isize[0], index[0],
&sg, &sk, *nslicex, *nslicey, nslicez, sg_grid, sk_grid);
find_tetra_order_grid(top, ePBC, natoms, box, x, isize[0], index[0],
&sg, &sk, *nslicex, *nslicey, nslicez, sg_grid, sk_grid);