FROM TH2F
constant
17.45079477192762+-0.539301937214567
chi2/ndof = 18.143865184370362
plane
1.9749286456193405+-1.1593875336689792
invpt slope = 16.36371320948471+-0.8449232640961608
theta slope = 5.459583282328216+-1.793583473400537
chi2/ndof = 11.845019517689181
from tgraph2D
constant
29.832082794499065+-4.664775591905267
chi2/ndof = 1632.0098479250944
plane
-3.5107656516321586+-7.6505685801449115
invpt slope = 29.988037060570427+-4.581919139933091
theta slope = 11.059597868623015+-12.10924796968653
chi2/ndof = 1021.7593540327458