FROM TH2F
constant
1.6288408093515663+-0.1263686178176534
chi2/ndof = 44.57445126237939
plane
-42.06751179893995+-1.5455581285517856
invpt slope = -2.894159067806925+-0.08890672379352482
theta slope = 62.105868263683085+-1.644079564583173
chi2/ndof = 27.531312390004747
from tgraph2D
constant
45.90935226549682+-2.9676876652537976
chi2/ndof = 933.5600273024668
plane
-1.6343000273905588+-29.47741450909569
invpt slope = -1.6692249015255272+-1.076675972176982
theta slope = 45.77620906589392+-24.2130590248594
chi2/ndof = 901.1203381186031