FROM TH2F
constant
3.7063216203263165+-0.23519828483788477
chi2/ndof = 19.675855803662724
plane
33.835473708866864+-1.0816958702257897
invpt slope = -10.600316828564925+-0.5847596083059959
theta slope = -9.59133829096319+-1.287213809118594
chi2/ndof = 6.48913017848038
from tgraph2D
constant
22.118869409490387+-1.1433550759595765
chi2/ndof = 109.8099097210751
plane
24.319232054272884+-2.389536315453776
invpt slope = 1.5681235694690656+-1.6075831416072783
theta slope = -5.912007346182936+-3.043926031226143
chi2/ndof = 106.74664840082868