V=[11.3057   28.2642   55.5453   79.6313  101.9969  122.8879  146.9739...
  126.5745   99.2934   70.2919   47.6805   21.6283   12.0430   16.9585...
   21.1367   21.3825   21.3825   22.8571   23.3487   23.3487   27.0353...
   30.2304   34.1628   38.8326   42.5192   45.2227   44.7312   39.0783...
   33.9171   29.0015   23.5945   20.8909   21.1367   21.3825   21.1367...
   20.8909   22.6114   25.0691   24.5776   20.8909   20.3994   17.4501...
   12.0430]
tt=[31.3725   32.0646   32.5260   32.7566   33.2180   33.9100   34.1407...
   35.7555   36.6782   37.1396   38.2930   38.2930   38.9850   40.1384...
   42.9066   46.3668   49.1349   50.9804   54.2099   57.9008   60.6690...
   62.9758   65.2826   67.8201   69.8962   71.7416   73.3564   75.8939...
   77.5087   80.5075   81.6609   84.8904   89.0427   94.5790  100.5767...
  104.2676  108.6505  111.6494  116.4937  119.2618  124.1061  127.5663...
  128.9504]
plot(tt,V,'b-',tt,V,'ro')
title('Measured data')