nsion
                (6) 0/1 = off/on y dimension
                (7) 0/1 = off/on z dimension
         springforce
                (1) x position of spring origin
                (2) y position
                (3) z position
                (4) force constant k (so that k*distance = force units)
         dragforce
                (1) x position to drag atom towards
                (2) y position
                (3) z position
                (4) force magnitude f (in force units)
                (5) delta