FROM TH2F
constant
16.39784963769581+-0.4444822306947029
chi2/ndof = 5.3962547966358665
plane
16.916310011583352+-1.0277816844021437
invpt slope = -0.09679623243481483+-0.4758394452583735
theta slope = -0.6588583039334424+-1.5453931884585903
chi2/ndof = 5.527239779026834
from tgraph2D
constant
19.88663449337385+-1.0007990344249669
chi2/ndof = 99.1582719664242
plane
9.217122867809268+-1.5894712821350603
invpt slope = 7.190145534702081+-0.778252318834427
theta slope = 4.169826512864432+-2.180307957954288
chi2/ndof = 51.095867930516754