- Chip peds are describe by linear relation : A+B*stripID . Allow A,B vary event by event.
- Pedestal residua (constant per run) were subtracted.
- ADC used below is calculated as: ADC= - [ rawAdc - chipPed(event) - stripPed(run)]
Details of this procedure are given at here ,
(see 200 events PDF )
Example of one event: raw ADC (top) , after ped correction (bottom). Plane U (V) spans X-axis 0-191 (192-383).
Vertical green lines mark chip boundaries. Pedestal are marked be the ~horizontal green line. For this event pedestal fit failed QA for the 3rd chip ( magenta) and all ADC's are cleared to zero.