Only one view of the calorimeter prototype is equipped with fibers, PMTs and electronics.
This choice  allows to reduce substantially the prototype cost and is justified by the results of the simulations.
As GEANT 3.21 based Monte Carlo simulations confirms, instrumenting a single view,
the electromagnetic and hadronic resolution is degraded by a factor sqrt(2).
This is clearly shown in the figure where the simulated data concerning the electromagnetic and hadronic  energy resolution for one and two views instrumented calorimeter are reported.

In the following, instead, there are the measured one-view energy resolutions  (real data) obtained by means of gaussian fits to the ADC spectra for pions and electrons respectively.