  Using QCD-inspired time dependent cross sections for pre-hadrons we provide a
combined analysis of available experimental data on hadron attenuation in DIS
off nuclei as measured by HERMES with 12 and 27 GeV and by EMC with 100 and 280
GeV lepton beam energies. We extract the complete four-dimensional evolution of
the pre-hadrons using the JETSET-part of PYTHIA. We find a remarkable
sensitivity of nuclear attenuation data to the details of the time-evolution of
cross sections. Only cross sections evolving linearly in time describe the
available data in a wide kinematical regime. Predictions for experimental
conditions at JLAB (5 and 12 GeV beam energies) are included.
