Using our complete momentum measurements for 2-, 3-, 4-and 5-pion final states, we have studied the impact parameter structure with the following principal results: 1) evidence is presented for an empirical method that can help in the separation of coherent events on nuclei; 2) incoherent nuclear production exhibits lower-bound impact parameters which systematically decrease with increasing number of produced pions; 3) the experimentalb-distributions can be very well fitted by a single simple scaled functional form dσN(b)/d2b ∞F(N/f(b)); thisN-distribution yields a dispersion divided by an average, at any impact parameterb, of about 0.35.