These plots were made from the same set of 5000 single-gamma events that I have been using all along, as well as 5000 single-piminus and single-muon events with the same characteristics.  Note that for gamma and piminus the seed tower threshold was 1 GeV and the cluster threshold 4 GeV, while for muons these were both .25 GeV.  In each figure, the four preshowers in front of a 2x2 cluster of towers are treated as a cluster, and this preshower cluster's energy, (energy-weighted) eta, and (energy-weighted) phi are plotted, as well as the preshower cluster energy vs. the tower cluster energy (both in GeV).  Figure 1 shows these plots for gammas, Figure 2 for piminus, and Figure 3 for muons.  Pdfs are attached below.

Figure 1

Figure 2

Figure 3