FROM TH2F
constant
6.074239378269189+-0.24770133883830459
chi2/ndof = 1.5439263749957086
plane
2.5655988940729593+-0.6286227080846464
invpt slope = 1.308807682601739+-0.32026736658411625
theta slope = 2.953574587024365+-0.6712631371694713
chi2/ndof = 1.1913223978483412
from tgraph2D
constant
7.202496385690665+-0.6367203695830858
chi2/ndof = 47.4333010506908
plane
1.1151236969751135+-1.2429836518614923
invpt slope = 2.90504868845705+-0.6005479854074979
theta slope = 3.9885194818834506+-1.4537711619139175
chi2/ndof = 36.85266699682531