8GeV generator not centering the beam #97

The 8GeV electron generator is not centering the beam on the target and now that I mention it, the 4GeV beam isn't doing that either although they are both within ~5mm of the center in the horizontal direction and seemingly perfectly centered vertically.

These distributions were made using the 4gev and 8gev particle gun generators currently in SimCore and then a filter on the total energy of the primary electron as it reaches the ECal was applied. This was the sample I had readily available for my work with EaT, it'll probably be a good idea to do an unfiltered sample to make sure my selection isn't biasing how the electron reaches the target.