Two photon events are the ones that are above BOTH of the magenta lines.

One photon events are the ones that are below the black line.

The rest are "ambiguous", but I believe my code currently makes them mostly into 1 photon due to the funniness of the chi2 calculation. 

Fig. 1. Data

Fig. 2. Simulation

Now with the same cut (inner central) for all 4 cases

Fig. 3. Data, same cut for all 4

Fig. 4. Simulation, same cut for all 4