step120=[0 0.001 0.009 0.038 0.092 0.153 0.231 0.331 0.445 0.576 0.725 0.893 1.082 1.286 1.499 1.734 1.965 2.225 2.496 2.782 3.08 3.408 3.738 4.082 4.439 4.811 5.223 5.644 6.062 6.512 6.979 7.472 7.97 8.47 9.02 9.688 10.239 10.875 11.483 12.086 12.675 ];
a=[0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 ];
plot(a,step120);
