FROM TH2F
constant
2.377366543845882+-0.21381905295412912
chi2/ndof = 73.59685331840893
plane
-74.15601708873598+-1.687462229249222
invpt slope = -4.914363950414593+-0.8929315455052516
theta slope = 155.79526813142536+-2.723723778287106
chi2/ndof = 9.696821003735241
from tgraph2D
constant
78.39052238450401+-4.891014641813737
chi2/ndof = 1435.3214544156388
plane
-1.2407882482572887+-16.50217784535408
invpt slope = -15.528413833212612+-4.434246884698336
theta slope = 102.77924752743439+-16.84349831183634
chi2/ndof = 819.7513719001558