FROM TH2F
constant
27.02056629334249+-0.7425901482516949
chi2/ndof = 4.29934434766959
plane
6.290036200218047+-1.856542410117424
invpt slope = 12.195037780046682+-1.33518781629098
theta slope = 25.571106196106413+-2.8957598736962273
chi2/ndof = 1.2568510456399475
from tgraph2D
constant
27.853492646746624+-1.6687431687840093
chi2/ndof = 175.4363368595078
plane
7.672786533851501+-1.7943789676362367
invpt slope = 13.619811977725043+-1.267759158284922
theta slope = 22.936382579946585+-2.9770002098114805
chi2/ndof = 45.50842536073494