FROM TH2F
constant
21.0613431875562+-0.7167226083389403
chi2/ndof = 12.552490755806016
plane
6.44068271100375+-1.6463388888217618
invpt slope = 9.059931920419734+-1.2573884603482997
theta slope = 20.04973467101155+-3.072375032801316
chi2/ndof = 10.602242526703083
from tgraph2D
constant
27.900154354401206+-4.386457582702048
chi2/ndof = 1039.0145468232708
plane
-2.371520968201107+-7.243037611692048
invpt slope = 26.570074901493438+-5.586716010110774
theta slope = 29.737340394978037+-13.808545769504276
chi2/ndof = 678.5499551065993