
def _tsase_func():
    atoms = _buffers[_current_buffer]
    x = max(atoms.positions[:,0]) - min(atoms.positions[:,0]) 
    y = max(atoms.positions[:,1]) - min(atoms.positions[:,1])
    z = max(atoms.positions[:,2]) - min(atoms.positions[:,2])
    atoms.cell = numpy.array([[x + 1, 0, 0],
                              [0, y + 1, 0],
                              [0, 0, z + 1]])

_tsase_func()


