FROM TH2F
constant
0.017132074916933936+-0.01482032341385793
chi2/ndof = 0.009642504532057557
plane
0.03260558312386418+-0.172929138822822
invpt slope = 0.005470176630316218+-0.006789013692487796
theta slope = -0.025155229558357466+-0.14842531019774854
chi2/ndof = 0.0005772053642045657
from tgraph2D
constant
0.0257292373293505+-0.0015752975644053636
chi2/ndof = 0.00020100655573292403
plane
0.0448849747086831+-0.004992899036832504
invpt slope = 0.005495294493868348+-0.00019014256590555866
theta slope = -0.035641297784191596+-0.004334897994349157
chi2/ndof = 1.617394084057067e-05