FROM TH2F
constant
0.005168831664951353+-0.016076118414308938
chi2/ndof = 0.011148947690075253
plane
0.10364763112693422+-0.2769852867195778
invpt slope = -0.004098452993287634+-0.033432210131384255
theta slope = -0.06965857738379279+-0.2164046406568285
chi2/ndof = 0.0036126441016852274
from tgraph2D
constant
0.01513785401203935+-0.0012061049695527809
chi2/ndof = 3.345785154434356e-05
plane
0.04751689346315039+-0.01500207803244678
invpt slope = 0.0016751411477025993+-0.001390218363248884
theta slope = -0.0275982452946201+-0.011675646929403255
chi2/ndof = 2.4717486602574018e-05