FROM TH2F
constant
4.208955745071563+-0.25253129893355375
chi2/ndof = 2.767543406237395
plane
18.32882174093035+-2.0233291260924817
invpt slope = -1.5223673011269998+-0.16406316749810546
theta slope = -8.322162923341278+-1.6937083050835562
chi2/ndof = 0.9575410556558857
from tgraph2D
constant
6.9741630525189535+-0.34102602748705535
chi2/ndof = 8.489808855419263
plane
19.88337692890068+-1.1125602257710456
invpt slope = -0.750689907419328+-0.13981683613158696
theta slope = -10.27217350722179+-1.003014474009636
chi2/ndof = 2.5088488211355866