FROM TH2F
constant
0.02570692976879043+-0.01627943163242333
chi2/ndof = 0.02880009304526605
plane
0.13189662747322484+-0.11059754344935734
invpt slope = 0.008246156114899261+-0.011812012056347142
theta slope = -0.09778362760101303+-0.08399084772181599
chi2/ndof = 0.009997326168970293
from tgraph2D
constant
0.05212202767215735+-0.004422586892362831
chi2/ndof = 0.0019950460311694888
plane
0.18006804030330775+-0.015376294316415426
invpt slope = 0.01093781781847197+-0.001670799447776667
theta slope = -0.1381465453342105+-0.012674104820915428
chi2/ndof = 0.0007626683099780971