FROM TH2F
constant
18.851799244254813+-0.5908531065191369
chi2/ndof = 15.396374814304535
plane
6.45805860909709+-1.349158464407473
invpt slope = 19.641031174320126+-1.0917284778318301
theta slope = -3.3712640414542414+-1.9214328533289267
chi2/ndof = 9.643000232022901
from tgraph2D
constant
29.495049702845293+-3.8104453310292814
chi2/ndof = 987.3255655212721
plane
4.555555893266261+-5.840606926199588
invpt slope = 30.768129961517765+-3.9601012743007677
theta slope = 0.31178688591428827+-9.312013522901008
chi2/ndof = 525.6850351936465