E is of the order of the accuracy.
Since is of the order 100 the accuracy of is better than for the groundstate energy of the 60 sites systems. The phase sensitivity for repulsive interaction and disorder . The most striking result is the strong fluctuation of the phase sensitivity, which varies over more than four orders of magnitude for the 60 site ensemble. The datas are the same as in Figure . The slope of the upper regression line indicates a localization length .