FROM TH2F
constant
0.015958234086714086+-0.015668800004849177
chi2/ndof = 0.010384848658653432
plane
0.06249884848020622+-0.110234826588497
invpt slope = 0.006717641038200391+-0.014601972530023778
theta slope = -0.044555868005001414+-0.08613700264362782
chi2/ndof = 0.002619323815408899
from tgraph2D
constant
0.02446241082240703+-0.002124094943476534
chi2/ndof = 0.0003158245530190845
plane
0.08980312098861948+-0.005299433190583123
invpt slope = 0.006423757530901733+-0.0008426490768428524
theta slope = -0.0660170565119914+-0.004481761016460492
chi2/ndof = 6.755330253808793e-05