FROM TH2F
constant
60.62944856564811+-0.9306637309564224
chi2/ndof = 19.264929990522532
plane
58.60461583610743+-5.392453794523045
invpt slope = 14.970945010662199+-0.8544758854669602
theta slope = -18.40998987113225+-4.71096208360133
chi2/ndof = 15.236838787282853
from tgraph2D
constant
76.04166675939963+-4.150647925556693
chi2/ndof = 1292.090868973642
plane
100.91354112648469+-18.10680150605306
invpt slope = 15.339481526449358+-3.1546141419722136
theta slope = -44.45750995092971+-15.270943425090808
chi2/ndof = 939.5545368778761