FROM TH2F
constant
23.94646379318907+-0.6317497370369548
chi2/ndof = 41.913196042074794
plane
-8.529788141270824+-3.6469429529369815
invpt slope = -10.274938036667445+-0.6170262651629774
theta slope = 56.97029985581423+-3.7185492606760024
chi2/ndof = 34.544909576134934
from tgraph2D
constant
69.33464266178153+-5.367762987050541
chi2/ndof = 1901.6500463734067
plane
18.350445424332644+-25.964250349113993
invpt slope = -0.8802380793607172+-5.751741043413619
theta slope = 52.301095937391906+-23.189541372594
chi2/ndof = 1808.7367174142157