Petr's comments on the FastSimu for eta dependence

In data-driven simulation, we claim some of the variable have eta dependence such as the HFT match ratio.
But in the final validation procedure, we always compare the final efficiency vs pT, not eta. 
So here is just a quick check with polts, even though we don't expect problem.

Attaches is the same procure as we did using Hijing samples. we check step by step, compare the efficiency from Hijing and from fast-simulation.
First is camper with TPC acceptance and track cut.
Second is converge to HFT acceptance which is effect by matching ratio.
Last is compare the final efficiency with topological cuts.