{{ 1,-1,0.002,0.004}{ 2,1,0.002,0.004}{ 3,2,0.002,0.004}{ 4,3,0.002,0.004}{ 5,4,0.002,0.004}{ 6,5,0.002,0.004}{ 7,6,0.002,0.004}{ 8,7,0.002,0.004}}