FROM TH2F
constant
14.158764871772554+-0.36721298960513576
chi2/ndof = 15.660446644361997
plane
31.81664243684723+-2.181619229370755
invpt slope = -6.02328238240455+-0.21995282581921674
theta slope = 9.272350964996097+-1.998441521977105
chi2/ndof = 8.60288393945259
from tgraph2D
constant
30.629069964489986+-2.2904250948756952
chi2/ndof = 582.3112295403606
plane
80.98965100504918+-9.184989905067097
invpt slope = -8.601397860041441+-0.7513601941753693
theta slope = -22.802870193348912+-8.810094885648368
chi2/ndof = 250.92162338556466