FROM TH2F
constant
0.017356687086511752+-0.01729893712595205
chi2/ndof = 0.0025778120130243525
plane
0.0014655971091206317+-0.16733451754360576
invpt slope = 0.0013883626444371473+-0.010258117457702037
theta slope = 0.010812714020326186+-0.14387026634656225
chi2/ndof = 0.0021170520985888223
from tgraph2D
constant
0.018706401708575186+-0.0009059973843539226
chi2/ndof = 5.171236940876457e-05
plane
0.005605865893627488+-0.008082091529409668
invpt slope = 0.0017733529715358138+-0.0004932337518991945
theta slope = 0.007571217244999809+-0.00686806395316565
chi2/ndof = 4.181395605714545e-05