FROM TH2F
constant
0.023543817806079767+-0.024570055677706586
chi2/ndof = 0.001953070269478097
plane
-0.017061391577351207+-0.29183303239627434
invpt slope = 0.004870427046692616+-0.022086244498122083
theta slope = 0.02685090956928164+-0.24244983589483574
chi2/ndof = 0.00018500251695955416
from tgraph2D
constant
0.024638343761443353+-0.0010569841677676901
chi2/ndof = 4.804026782912751e-05
plane
-0.01664228347179437+-0.004113634225800592
invpt slope = 0.004592420499458027+-0.000280067856235261
theta slope = 0.027190609354877274+-0.0033510111982208404
chi2/ndof = 5.186960519429128e-06