FROM TH2F
constant
3.8610641161277193+-0.29622872443915954
chi2/ndof = 50.74798204225895
plane
73.81039359860046+-3.6944313558475326
invpt slope = -25.137296915893607+-0.6994225838759162
theta slope = -9.374636629901133+-3.5966605847499253
chi2/ndof = 21.597507625573403
from tgraph2D
constant
62.586926374359784+-7.060694324026128
chi2/ndof = 2492.670218185256
plane
149.02382457844402+-30.73983672317382
invpt slope = -37.018225691206794+-7.466440726170115
theta slope = -52.26277769314737+-31.000654666414516
chi2/ndof = 1703.304054068326