FROM TH2F
constant
1.1083246338885275+-0.1519542580696358
chi2/ndof = 64.12153466906098
plane
89.7566983079698+-4.200114383950779
invpt slope = -15.90041741714802+-0.36242644637708593
theta slope = -8.306137521824281+-3.0251244953644223
chi2/ndof = 24.19883685639051
from tgraph2D
constant
62.74051352203181+-4.908742896702622
chi2/ndof = 1252.9793561417544
plane
128.83155571405086+-59.65603598914968
invpt slope = -2.8864439816296317+-3.228540952236745
theta slope = -48.981709573017+-48.427671388186674
chi2/ndof = 1257.3599260873173