FROM TH2F
constant
20.899295133237636+-0.10261239959175203
chi2/ndof = 63.08080259349423
plane
0.007886423062183567+-0.4862103488976298
invpt slope = 9.367663312199266+-0.19784407628401537
theta slope = 4.831123456937689+-0.41812194930583824
chi2/ndof = 55.19234777124698
from tgraph2D
constant
19.444399326582754+-0.7462539266964137
chi2/ndof = 184.8891146864279
plane
9.863817802441165+-2.0117490513627736
invpt slope = 5.238388831084369+-0.8772346239709298
theta slope = 2.633100203750965+-2.4662121905290593
chi2/ndof = 166.8000354277263