FROM TH2F
constant
0.02544099275024176+-0.0240458807400165
chi2/ndof = 0.005516626303748308
plane
-0.013738769436529404+-0.1990784747040964
invpt slope = 0.0038054803052843126+-0.020844781250735814
theta slope = 0.0291493554668528+-0.1805949553386656
chi2/ndof = 0.004056812878403701
from tgraph2D
constant
0.02978629413346951+-0.0019191186932339783
chi2/ndof = 0.0001767847948169102
plane
-0.0017625153263407679+-0.01467340135365321
invpt slope = 0.005726339979495101+-0.0012709076478560632
theta slope = 0.018498277956725238+-0.013025847068897483
chi2/ndof = 0.00011903265750811734