FROM TH2F
constant
9.699329074558127+-0.3439251386200594
chi2/ndof = 1.5243936135818865
plane
6.424579592910949+-0.8218990490514946
invpt slope = 1.5913458351985064+-0.45411273605707686
theta slope = 2.317491832149824+-1.0999822966087651
chi2/ndof = 1.3065481714502634
from tgraph2D
constant
10.697709692297797+-0.6364421146711657
chi2/ndof = 39.69573943366326
plane
6.317712853413462+-1.277248055514274
invpt slope = 2.8459835527093422+-0.6407242822748543
theta slope = 2.0568150301258705+-1.7366009217624767
chi2/ndof = 32.7770922273262