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The comparison of Oct 8 and Jun 28 pedestals (LEX8 and HEX8 ranges) is shown on the following plot:
The pedestal drift is significant : (between -12 and +18 ADC units), this confirms the need to switch to the recent file.
The time evolution (since launch) of the "pedestal temperature" defined by the slope of the above corellation is shown on the following set of plots:
While the non-thermal drift of pedestals is not yet understood, it is still going on at the rate ~0.5 degrees (equivalent temperatute change) per month, so we have to update our pedestals every 2 months.