Add property to scale xtalk between middle and back layer of LArEM
Add property to scale xtalk between middle and back layer of the LAr EM calorimeters (set to 1 by default) Needed to produce dedicated samples for e/gamma calibration studies
Add property to scale xtalk between middle and back layer of the LAr EM calorimeters (set to 1 by default) Needed to produce dedicated samples for e/gamma calibration studies