FROM TH2F
constant
5.253261387362717+-0.26825824252480046
chi2/ndof = 12.999044937456581
plane
4.774067280669876+-0.6538641869770647
invpt slope = -0.7706894590687816+-0.34907325666705574
theta slope = 2.3479294944250966+-0.8204208957552802
chi2/ndof = 13.209522464765476
from tgraph2D
constant
15.71006236589902+-4.10054914522823
chi2/ndof = 1513.3052966809428
plane
-15.253459176882988+-7.8932612223975545
invpt slope = 9.890478235148603+-4.836232178490958
theta slope = 35.81861828685115+-10.297518320122652
chi2/ndof = 1260.4893120034878