FROM TH2F
constant
5.646108795449206+-0.2160140181985763
chi2/ndof = 0.2860708082672778
plane
7.767549369719869+-1.4280846125157522
invpt slope = -0.166829598894087+-0.10532280188224834
theta slope = -1.3560173806582538+-1.2252878316412728
chi2/ndof = 0.2597594507189851
from tgraph2D
constant
5.945053520653212+-0.10830474957313617
chi2/ndof = 1.4896996832476967
plane
9.24947152764536+-0.6042766353736495
invpt slope = -0.1223910857057298+-0.04448267366420459
theta slope = -2.631486988381772+-0.5323721370424733
chi2/ndof = 1.1940678306283008