FROM TH2F
constant
0.019116174070937145+-0.018643143557152634
chi2/ndof = 0.022565610899785666
plane
0.11335924206848118+-0.1522862946806961
invpt slope = 0.007975504422906652+-0.019325294142593468
theta slope = -0.08695229269435596+-0.12275775993337715
chi2/ndof = 0.009270359191090425
from tgraph2D
constant
0.03861137214990844+-0.005542617201810271
chi2/ndof = 0.001812515721553112
plane
0.21368999877194836+-0.01651112379506641
invpt slope = 0.005664113178298084+-0.003107187497817546
theta slope = -0.16812386665675375+-0.014323972692528796
chi2/ndof = 0.0005371981782827123