We see a 1cm shift of Tof LocalZ in HLT QA plot with the T0 about
4ns calibration by Maxim.We guess there may be something in the Global T0 of TPC.
So I did a simple test: create a local StarDb and put the T0
calibration table in it and try different T0 offset to see how
the TOF localz acts. In the attachment is TOF localz from
HLT QA plot with different global T0 offsets. Black line, blue line
and red line are with T0 offsets -160ns , 0ns, 100ns.
And the one with -160ns is look like a normal QA plot but the T0 offset
seems unacceptable.
You can find the local CINT table file at:
/star/u/yiguo/worksdir/fastchain/HLT_param/hitmaptest/tpcHitMapSector/StarDb/Calibrations/tpc/tpcPadrowT0.20120201.000001.C

HLT online monitor:

http://online.star.bnl.gov/HLT/