To estimate the effect of calorimeter pedestals drift due to temperature variations during pointing observation I compared pedestals determined from the run 336653327 collected at the end of pointing observation  with initial pedestals from 336481519 collected just before the start of pointing observation .

Pedestal drift for each calorimeter channel is shown on four histograms below, separately for each energy range:

The contribution of pedestal drift to energy measurement error is less than 0.012 MeV/2 MeV = 0.6% (for LEX8 range) and even smaller for other ranges.

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