FROM TH2F
constant
0.01712867650580361+-0.019296697456022603
chi2/ndof = 0.0033376425962800957
plane
0.03900604075921804+-0.14743005345546348
invpt slope = 0.0017433467582845534+-0.017735620187751464
theta slope = -0.022009138323136713+-0.13285039280898542
chi2/ndof = 0.0027712267269947356
from tgraph2D
constant
0.019015330948611495+-0.001047038805870122
chi2/ndof = 5.591080331077477e-05
plane
0.02831985140190562+-0.006689961781940226
invpt slope = 0.004058767728852596+-0.0007122973371439041
theta slope = -0.014417853529934336+-0.006161661676651947
chi2/ndof = 3.427645078600281e-05