FROM TH2F
constant
0.016917905358430272+-0.020827684582515882
chi2/ndof = 0.004393828609887296
plane
0.0430859616697942+-0.17273711832530636
invpt slope = 0.002837193494831106+-0.023926031146903035
theta slope = -0.025555664295295343+-0.14143666662128224
chi2/ndof = 0.003372023560311228
from tgraph2D
constant
0.020425739242012332+-0.001207713339774696
chi2/ndof = 6.271857497585717e-05
plane
0.04365255946671352+-0.006892700541954476
invpt slope = 0.004275753682089982+-0.0008083404897871941
theta slope = -0.025320479358452264+-0.005563476250873113
chi2/ndof = 2.496895605459228e-05