FROM TH2F
constant
23.99128755616904+-0.6122612744791925
chi2/ndof = 38.98115402959975
plane
-30.492348770004703+-4.42311981666461
invpt slope = 0.395046123092734+-0.3306161696670205
theta slope = 53.321338488794815+-3.5158017962275383
chi2/ndof = 33.51594168099849
from tgraph2D
constant
67.06246651707906+-6.221451526439881
chi2/ndof = 2748.1585980657965
plane
-57.27383370319056+-37.998096459657766
invpt slope = 1.6990462136248863+-2.934968366929978
theta slope = 108.5005782560392+-29.662395446187098
chi2/ndof = 2272.082833080567