FROM TH2F
constant
19.08954194502481+-0.6118044984508173
chi2/ndof = 41.37479357473753
plane
-100.59075381190755+-5.87965485619931
invpt slope = -0.2136424737984708+-0.5019318562433965
theta slope = 112.64477709339978+-4.964013220175137
chi2/ndof = 31.208815960922788
from tgraph2D
constant
64.5309329467485+-6.314685559668457
chi2/ndof = 2193.1389596433096
plane
81.20710130668273+-70.07031747403816
invpt slope = -3.143405436944102+-4.5439805324794085
theta slope = -8.302170149265692+-56.07840874632275
chi2/ndof = 2256.2926452298902