Here is the update of uncertainties from trigger bias.

We extract D_TT value from model calculation based on the parameters (fz, decay_fraction, flavor_of_outgoing_parton ) before and after trigger conditions.

1,  Uncertainties from fz change

Graph:
for Lambda:          http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/fz_result_pic/tBias_fz_a_L_J1.eps
for anti-Lambda:  http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/fz_result_pic/tBias_fz_a_A_J1.eps

D_TT extracted from model calculation and the shift = ABS[(JPX-ZB)/ZB] :
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/fz_result/
(There is no difference between etap and etan items)

2,  Uncertainties from decay fraction change (Feed down):

Graph:
for Lambda:          
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/decay_result_pic/tBias_decay_etan_a_L_J1.eps  (eta<0)
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/decay_result_pic/tBias_decay_etap_a_L_J1.eps  (eta>0)

for anti-Lambda:  
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/decay_result_pic/tBias_decay_etan_a_A_J1.eps  (eta<0)
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/decay_result_pic/tBias_decay_etap_a_A_J1.eps  (eta>0)

D_TT extracted from model calculation and the shift = ABS[(JPX-ZB)/ZB] :
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/decay_result/
(etan ~ eta>0,   etap ~ eta<0)

3,  Uncertainties from parton flavor change:

Graph:
for Lambda:          http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/fparton_result_pic/tBias_fparton_a_L_J1.eps
for anti-Lambda:  http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/fparton_result_pic/tBias_fparton_a_A_J1.eps

D_TT extracted from model calculation and the shift = ABS[(JPX-ZB)/ZB] :
http://www.star.bnl.gov/protected/spin/jcmei/pp200trans_2012/dataBase/simu/tBias_results/fparton_result/

Summary:
The uncertainty form feed down is small relatively.
The uncertainty form fz is really large and becomes larger with trigger threshold increasing. Considering the statistics of trigger samples, the combined uncertainty from fz is roughly equal to the average of JP1 and JP2 and about 40% ~ 55%.
The uncertainty form parton flavor for anti-Lambda is smaller than Lambda. It is about 40% for Lambda and 20% for anti-Lambda.

The statistics of model calculation may be not enough.