FROM TH2F
constant
6.768904715715587+-0.4063191322148008
chi2/ndof = 17.189456257539245
plane
8.862112033271334+-1.9224130175764347
invpt slope = -4.331764962385739+-0.6329902067373677
theta slope = 7.440795744644398+-1.7918825629905866
chi2/ndof = 15.225245914684212
from tgraph2D
constant
28.629236555754566+-4.086148093984834
chi2/ndof = 801.4371014210603
plane
98.9094505022187+-15.350134268394346
invpt slope = -25.25004066958731+-3.9196611634430463
theta slope = -56.10688316614912+-16.47970625076775
chi2/ndof = 428.974145433503