FROM TH2F
constant
6.131311738355076+-0.2918169073353123
chi2/ndof = 0.8093257224286519
plane
12.732641944456358+-1.661651353058358
invpt slope = -0.7698802417423498+-0.22052309011706062
theta slope = -4.252012108928515+-1.550454371826908
chi2/ndof = 0.3758938135627731
from tgraph2D
constant
7.057084780600354+-0.279113651512203
chi2/ndof = 6.154450004699564
plane
15.19986128427609+-0.9278829067176949
invpt slope = -0.6740249511871941+-0.13302513899028745
theta slope = -6.363011036738087+-0.8930320894881666
chi2/ndof = 2.4312356881098998