  CMS calorimeter energy calibration was done in the full CMS simulated
geometry for the pseudorapidity region eta = 0. The samples of single pion
events were generated with a set of incident energies from 10 GeV to 3 TeV. The
analysis of the simulated data shows that standard calibration using just
sampling coefficients for calorimeter parts with different sampling ratio gives
nonlinear calorimeter response.
  Non-linear calibration technique was applied for improving calorimeter energy
resolution and restoring the calorimeter linearity.
