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Time scale values are obtained by first reducing time scales(
) with femto-second and then taking logarithm (e.g. 1 corresponds to 10 
, 2 corresponds to 100 
, 3 corresponds to 1 
, etc.) Time scales mentioned in figures hereafter are the same. (a) ensemble average of 
as a function of time scales. (b) Distributions of 
at 10 
(square), 1 
(circle), 100 
(upwards triangles) and 10 
(downwards triangles).
