FROM TH2F
constant
6.642146385319733+-0.2747343010252973
chi2/ndof = 0.2425413338625246
plane
4.677621934991102+-0.7104915764773473
invpt slope = 0.05342792929561099+-0.34930195267621417
theta slope = 3.3753995849130116+-0.8344696720674939
chi2/ndof = 0.05486389317741203
from tgraph2D
constant
6.817501268158496+-0.1330749368810067
chi2/ndof = 1.859438575779746
plane
4.807233792242895+-0.13703217835934112
invpt slope = 0.026136380398713036+-0.06820404546326955
theta slope = 3.358552298967544+-0.1712867693299962
chi2/ndof = 0.3947608407497759