FROM TH2F
constant
0.01969123168516812+-0.016203387173598115
chi2/ndof = 0.011417915547700028
plane
0.05500914525021747+-0.10603044007206985
invpt slope = 0.008380661706402254+-0.013033590274889045
theta slope = -0.03850578697156771+-0.08542176404265532
chi2/ndof = 0.0033171399664854192
from tgraph2D
constant
0.028848861658264814+-0.001927040339532275
chi2/ndof = 0.0003007922420676768
plane
0.06522124652025627+-0.006293454217579862
invpt slope = 0.008111385005077996+-0.0009167125571037425
theta slope = -0.04464221808237186+-0.005458449194820256
chi2/ndof = 0.00012055819765620749