Te-Chuan's slide

https://www.star.bnl.gov/protected/heavy/tchuang/Presentations/FTS/TeChuan_Pythia_20180925.pdf

- The pythia6 setup was from Elke. Two parameters.
- slide4/5/6 have the same problem with the silicon disk
   -- The potential problem could come from the local StRoot/StFtsFastSimulation
   -- The online one is for cbm-like and are not compatible with the default "ref6a"
   -- May refer to my original source code/directory
- Next action item may based on ref6 to study the QA performance with Pythia

Guannan
May rely on ref6 to tune the vz location