FROM TH2F
constant
0.03435990838402344+-0.01241290886457436
chi2/ndof = 0.035612584900179836
plane
-0.0038089406298877203+-0.028622438659016213
invpt slope = 0.015089739980388135+-0.006696071469087244
theta slope = 0.015072934118293678+-0.03356634135479274
chi2/ndof = 0.01253452036794431
from tgraph2D
constant
0.064993659892666+-0.0032458311921728282
chi2/ndof = 0.002539036249183788
plane
-0.006932254305630663+-0.0028769862278532794
invpt slope = 0.021600805842037087+-0.0005196959160660822
theta slope = 0.0065954429067509555+-0.003152482673704521
chi2/ndof = 0.0003093387999126607