Vincenzo Zappala' suggested to check how in a log-linear plot the distribution of orbital elements (a,e,i) versus the logarithm of the asteroid's diameter changes with time:  real asteroid families show a triangle-like distribution, with the largest asteroids clustered to the center and the smaller one more diffused.   We wanted to know if close encounters and Yarkovsky effect can account for the triangle-like distribution, given the initial more tight distribution of the synthetic families.  In the following plots we report results of our simulations at t = 0, 300, 500 My.

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