/StarDb/Calibrations/tpc/ :

I have noticed some differences in # of SSD hits when tables from different tags are used.

There was initially a difference btw TPC tables (tpcGas).

Yuri's email suggested to rename all devT tag tables with dev14 tag, based on y2011 tables  

You have for all tables with 

find StarDb/ -name "*.devT.C"

to create .dev14.C by copying 

find StarDb/ -name "*.y2011.C"

devT tables are for modified Tpc inner sector.

But doing that makes the BFC chain to take tables from real data, which we don't want :

top : tpcgas table from real data ; bottom ; tpc gas table from devE (renamed as dev14).

There is also another example where the table from devT gives no significant corrections then it switched off whereas in real data the table is used (TpcDriftDistOxygen)

 The differences between these 2 setup are found for tables :

• TpcZCorrectionB
• TpcDriftDistOxygen
• TpcGas
• TpcPressureB
• TpcLengthCorrectionB

Overall it has a small effect.

Plot below is for simulation ( 20events wth 50pions/ev) : # of SSD hits used in tracking ( 0= not used, 1 = used ).

For the same number of hits, less hits are used ( ~10) with the y2011 TPC tables (black line) than for devE tables (red line)