FROM TH2F
constant
0.013698686293973932+-0.013793459747084985
chi2/ndof = 0.02552895985971509
plane
0.016670005504544838+-0.15600618869022445
invpt slope = 0.005342462076268154+-0.0074146004605968934
theta slope = -0.011226646159630514+-0.11969834542772953
chi2/ndof = 0.018345107174375253
from tgraph2D
constant
0.0453214677774646+-0.008545529096650501
chi2/ndof = 0.006207215740791348
plane
0.20512763745179818+-0.061816414783486
invpt slope = 0.012958181783893312+-0.0020954051711576647
theta slope = -0.16570200585202685+-0.04682143280027771
chi2/ndof = 0.0034713153566511014