FROM TH2F
constant
27.792507131126836+-0.7455535810015741
chi2/ndof = 23.53779983817791
plane
-43.004103665259834+-3.476490389365388
invpt slope = -3.3156992341193523+-1.1264955924833524
theta slope = 86.61155832515703+-4.194291901283689
chi2/ndof = 14.988439225435789
from tgraph2D
constant
60.873641358458954+-5.973873481350531
chi2/ndof = 2034.1683703621713
plane
14.811344264981255+-22.644340029740167
invpt slope = -30.382371416515856+-4.981488294260339
theta slope = 83.6953810661775+-22.25931406070295
chi2/ndof = 1101.2813547285134