Monte-Carlo setup:

• Throwing one photon per event
• Full STAR y2006h/y2009a
• Throw particles flat in eta (1.08, 2.0), phi (0, 2pi), and energy (5-35 GeV)
• Using A2Emaker to get reconstructed Tower/SMD energy (no EEMC SlowSimulator in chain)
• Vertex z=0
• ~50K/per particle type
• Non-zero energy: 3 sigma above pedestal

Geometry configurations:

• y6h:v6.2:10KeV y2006h after fixing TPC/EEMC overlap (CVS:2009/12/17)
• y6h:10KeV y2006h Mising TPC material bug is resolved (CVS:2009/12/29)
• y9a:10KeV y2009a after Mising TPC material bug is resolved (CVS:2009/12/29)

Note: results are with CVS before "15Deg rotated volume" bug being fixed

Figure 1:Pre-shower migration: y2006h (red - CVS:2009/12/17) vs. y2006h (black - CVS:2009/12/29)

Figure 2: Pre-shower migration: y2006h (red) vs. y2009a (black) all with CVS:2009/12/29