The two bands below the protons band are deuterons and tritons. For the Dec 97 run, the data looked cleaner. Below are the same plots as above for Run 7868, taken under the same conditions. Events from the target cell windows are visible in the plot at left, but at a much lower level than for Run 8903. Simulated electrons were thrown over an angular range of 20 - 65 degrees.
Several things are evident.
The simulation shows the elastic tail extends mostly to negative missing mass, while the inelastic radiative tails extends to both positive and negative missing mass. However, there is more negative missing mass strength in the data than can be accounted for by the simulation. This accounts for much of the discrepancy between simulation and data. Here is an expanded view. The offset between simulation and data near the pion threshold is largely due to the negative missing mass background refered to in the panel at left.