FROM TH2F
constant
20.899295136112254+-0.02052247988938243
chi2/ndof = 1577.0200648373545
plane
0.007886423229749973+-0.09724206735978358
invpt slope = 9.367663312525325+-0.03956881395769784
theta slope = 4.831123456595276+-0.08362438944005392
chi2/ndof = 1379.808694281174
from tgraph2D
constant
19.4443993272558+-0.7462539268983421
chi2/ndof = 184.8891146864281
plane
9.863817802441165+-2.0117490513627736
invpt slope = 5.238388831084369+-0.8772346239709298
theta slope = 2.633100203750965+-2.4662121905290593
chi2/ndof = 166.8000354277263