FROM TH2F
constant
0.023567775401543024+-0.016554271351624766
chi2/ndof = 0.020032070553419982
plane
0.07821379819691657+-0.11084625552643833
invpt slope = 0.010279409034106493+-0.013470277306990911
theta slope = -0.05769827283218315+-0.08709116547261177
chi2/ndof = 0.0063965134665600245
from tgraph2D
constant
0.04109974025034192+-0.003368715056348093
chi2/ndof = 0.0010326899427993154
plane
0.09663470195584459+-0.011300260659990083
invpt slope = 0.01302987484316021+-0.0016622402418797668
theta slope = -0.07419131501689488+-0.00924014437262897
chi2/ndof = 0.00041467999020238335