FROM TH2F
constant
0.028138438654552386+-0.015850427735271913
chi2/ndof = 0.025233269603032075
plane
0.0927419856344114+-0.097718493772834
invpt slope = 0.009982354951633408+-0.010096321477430352
theta slope = -0.06911992385481369+-0.07965431553421728
chi2/ndof = 0.010670272597060168
from tgraph2D
constant
0.0506282609586563+-0.004338424270200023
chi2/ndof = 0.002220987168134875
plane
0.15194678565673864+-0.013895139605788982
invpt slope = 0.014528131812934574+-0.0017480956547138585
theta slope = -0.12381076315549194+-0.011986064354420853
chi2/ndof = 0.0009503117144014899