FROM TH2F
constant
46.57565535905322+-0.9039451091421775
chi2/ndof = 13.70056354280005
plane
-3.9135855342611734+-4.554105697904775
invpt slope = 9.232739806847281+-0.916894806361623
theta slope = 31.640353763707367+-4.061343614954439
chi2/ndof = 10.774247604225607
from tgraph2D
constant
58.938591734741244+-4.328346614695406
chi2/ndof = 1142.8096471247902
plane
38.58171728886209+-21.896390464456978
invpt slope = 13.547780682093315+-3.295566717178652
theta slope = -4.221837112285528+-18.758259179250498
chi2/ndof = 915.4573264913815