FROM TH2F
constant
17.086971266783863+-0.6231695246933653
chi2/ndof = 92.29891467585257
plane
36.5810529845657+-3.8730896964096626
invpt slope = -6.1489888016050775+-0.5622505850647787
theta slope = -5.402123850729351+-3.474833202922516
chi2/ndof = 92.84472650699811
from tgraph2D
constant
104.90714425734204+-9.79116243325967
chi2/ndof = 4697.476228396214
plane
1.3204031054837913+-63.760849058508505
invpt slope = 1.0001997927089181+-9.547658409970971
theta slope = 88.95585714703594+-56.09268848238262
chi2/ndof = 4628.550449288244