FROM TH2F
constant
24.582236056550595+-0.5226241054323375
chi2/ndof = 40.4359609095223
plane
-165.2530259191457+-6.025351558824219
invpt slope = -3.337017587610615+-0.16974800166648016
theta slope = 179.12147392917132+-5.328669960297588
chi2/ndof = 26.8931476406915
from tgraph2D
constant
64.34443355193201+-4.710155815069647
chi2/ndof = 2085.4433742803453
plane
-100.29554136693335+-38.62283553386478
invpt slope = -10.558978005925724+-1.1990131610041446
theta slope = 171.97655021153554+-31.41694543855635
chi2/ndof = 998.8691310072724