FROM TH2F
constant
25.783977582657993+-0.5677144706811514
chi2/ndof = 38.894691836175674
plane
4.078011253021357+-2.7857010259543187
invpt slope = -5.781213850003461+-0.377688307274681
theta slope = 37.55468886982061+-2.436417598263838
chi2/ndof = 33.71128768705138
from tgraph2D
constant
65.13316306951735+-5.123189973864058
chi2/ndof = 2231.0014175942642
plane
79.10562209119135+-29.016463475904843
invpt slope = 1.5665868552960267+-3.5470163753066393
theta slope = -15.702151685685603+-25.018630953020267
chi2/ndof = 2269.7687778029754