FROM TH2F
constant
0.01579207344017335+-0.015128470827358314
chi2/ndof = 0.015764232288860702
plane
0.0871994936980639+-0.1069238839803733
invpt slope = 0.006237371086268471+-0.013702361663105858
theta slope = -0.06327556728344026+-0.08328645652284261
chi2/ndof = 0.00480396412433001
from tgraph2D
constant
0.029349273955259284+-0.0031513520968214463
chi2/ndof = 0.0007348954826789467
plane
0.13409172850949108+-0.00716583247757458
invpt slope = 0.0065329403791959985+-0.0012781750393051749
theta slope = -0.10126442481532096+-0.006039433833430875
chi2/ndof = 0.00014695041851880503