FROM TH2F
constant
0.0034766392152980967+-0.0054983311416185315
chi2/ndof = 0.0076336987316294805
plane
0.0020569640800131134+-0.02716229198370195
invpt slope = 1.779816156962083e-05+-0.0024881218138774292
theta slope = 0.0012969321157856244+-0.024994140733997975
chi2/ndof = 0.007745093708473679
from tgraph2D
constant
0.011844652142866778+-0.0019438081042823206
chi2/ndof = 0.0005251962025667497
plane
0.007976350255480397+-0.007196685307671993
invpt slope = 0.00446070992044697+-0.0006821843917040306
theta slope = -0.007756311687258818+-0.006465595460849571
chi2/ndof = 0.0004053472587928911