The normal calibration code for shower detector was fixed according to the detector
changes and the electron/hadron left/right name change.
Last calibration of Shower/Preshower detectors was done on March 05.
Figure shows the energy deposit (espace var: cl_e) vs. x for shower and
preshower detectors. It shows that the pedestals are subtracted properly and the peak of
each block is aligned well. From the raw ADC spectra, can see that blocks on the
edge don't have enough events to observe the main peak. Calibration for these blocks are
done roughly by experience, which will not affect the overall efficiency much if the
production runs also do not have many events in these blocks.