Add E4 cells in transition region when calculating the egamma em fraction
requested to merge ATLAS-EGamma/athena:add_tilegap3_scintilators_in_crack_for_egamma_EMFraction into master
- Add E4 cells in transition region when calculating the egamma em fraction
- This was something done in release 21 as documented here : https://iopscience.iop.org/article/10.1088/1748-0221/14/12/P12006
the scintillator between the calorimeter cryostats is also added. This is referred to as the EM energy of the cluster, and the EM fraction (fEM) is the ratio of theEM energy to the total cluster energy.