FROM TH2F
constant
0.019111753497660866+-0.01799800058833879
chi2/ndof = 0.012317077376107639
plane
0.054506847981079035+-0.11904703746851945
invpt slope = 0.011203443123500315+-0.020511896822488707
theta slope = -0.039257810757099734+-0.09571448870250243
chi2/ndof = 0.004209819940624148
from tgraph2D
constant
0.028571028646581426+-0.0025185422942973425
chi2/ndof = 0.00041229859371770446
plane
0.07846068185336783+-0.007894019407989233
invpt slope = 0.010449524931569532+-0.0016392153121900436
theta slope = -0.05640771125411454+-0.006627762587511238
chi2/ndof = 0.00015534110853463563