The crystal then looks the same when viewed from any of the lattice points.
Then, by reflection is a lattice point on the original branch.
So collect all the edge displacements to begin at a single lattice point.
The general unit cell has an integral number of lattice points.
The cell may be chosen by first picking a lattice point.
Then, lines are drawn to all nearby (closest) lattice points.
Body (I): one additional lattice point at the center of the cell.
Each lattice point can be occupied by one monomer only.
Away from the lattice points, the electric field is given by:
Shallow holes such as the point are at a distance of from the nearest lattice points.