FROM TH2F
constant
12.135397733579543+-0.3969918990634032
chi2/ndof = 9.595794812755969
plane
5.865772036977108+-0.9951770424926603
invpt slope = 8.896949672150642+-0.6094402403622815
theta slope = -4.928131133454382+-1.16598061225099
chi2/ndof = 6.783030505491125
from tgraph2D
constant
19.521866241400605+-2.5181428281302014
chi2/ndof = 589.7170268472194
plane
4.387524548178731+-4.526233055265309
invpt slope = 16.315211536325638+-2.2649598074609822
theta slope = -5.367839265095887+-6.306154279140074
chi2/ndof = 381.4325662466275