FROM TH2F
constant
8.269408143643226+-0.3487247387418512
chi2/ndof = 23.048113483077692
plane
3.067146644289224+-1.6897797666912142
invpt slope = -11.339592353575545+-0.45747602018399913
theta slope = 38.222883430930295+-1.6737404360132997
chi2/ndof = 10.057423474341574
from tgraph2D
constant
36.800282003520756+-3.9000767472918545
chi2/ndof = 1125.5842982672277
plane
-11.882274761317065+-11.761494424787081
invpt slope = -19.31513036770848+-1.6229142444863047
theta slope = 78.03429879076037+-10.511271644857388
chi2/ndof = 306.76807008364113