# ATO-452: Ion tail in case of small statistic for calibration (Mesut) In case of small number of measurement Ar (missing HV scan) and low quality of measurement (low ion tail intensity) some calibration parameters can not be used: * No HV graphs * No position dependent graphs ( COG in the code) * No angular dependence
# ATO-452: Ion tail in case of small statistic for calibration
(Mesut)
In case of small number of measurement Ar (missing HV scan) and
low quality of measurement (low ion tail intensity) some calibration
parameters can not be used:
* No HV graphs
* No position dependent graphs ( COG in the code)
* No angular dependence

###  OCDB entry parsed and than used in the simulation and reconstruction:
OCDB entry - array of graphs:
* gr_<iroc|oroc>_<voltage>_<angle>_<position>

### Simulation usage
* array of ion tail with 20 local position used
** angle not used as the calibration data were not precise enough (also for Ne)
### Reconstruction usage
* array of ion tail with 20 local position used
** angle not used as the calibration data were not precise enough (also for Ne)
** additional fetch factor applied in the reconstruction to correct for missing
   charge (in the TPC/Calib/RecoParam)

### code modification for the Ar case - less precise calibration
The code addopted. (Not straigfoward) logic used:
* If Voltage<0 - voltage dependence is not used
* Angular dependence  - in case anluar info not present
  * average (code 4) used
* Position dependence - if there are not graphs  - graph[0] is used

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