FROM TH2F
constant
0.03295022893974874+-0.0199246257194022
chi2/ndof = 0.008743394068476332
plane
0.009490757898168833+-0.047528521747677646
invpt slope = 0.02136744801833234+-0.026223349405843612
theta slope = 0.0028029859649041275+-0.06202507945352388
chi2/ndof = 0.000591382173170471
from tgraph2D
constant
0.03750840346103019+-0.0020653154442983918
chi2/ndof = 0.0004222872605717128
plane
0.012007588814905296+-0.00136074716656021
invpt slope = 0.020938300082934506+-0.0006662622051927188
theta slope = 0.0019934577236488276+-0.0018665627480649216
chi2/ndof = 3.7448574421923945e-05