FROM TH2F
constant
0.021176438821856543+-0.01962208349192299
chi2/ndof = 0.02520641906921048
plane
0.004445992101239887+-0.04300997129361052
invpt slope = 0.0284817175260987+-0.03222889231016881
theta slope = -0.005243585327087491+-0.07119298621423896
chi2/ndof = 0.011081854465230384
from tgraph2D
constant
0.037778878344480876+-0.005466258951326664
chi2/ndof = 0.0020617190981786254
plane
-0.004813319963891402+-0.007094040286552873
invpt slope = 0.03819859984518826+-0.004457941375804837
theta slope = 0.014548411254327456+-0.01253499814079715
chi2/ndof = 0.0009051505477763726