FROM TH2F
constant
0.018117644194703207+-0.01434859994679344
chi2/ndof = 0.005123428652152258
plane
0.005312265957145459+-0.03391310276872871
invpt slope = 0.01251676145129916+-0.01890421840948866
theta slope = 0.0011975009690311064+-0.04141408224518815
chi2/ndof = 6.718376147740518e-05
from tgraph2D
constant
0.020261337758697602+-0.0011070326703615857
chi2/ndof = 0.00012867973999071156
plane
0.005416873515796675+-0.00030068182674496
invpt slope = 0.012392952600103596+-0.00014965621432193037
theta slope = 0.001341517420476389+-0.0003758447052002196
chi2/ndof = 1.9006550788095369e-06