FROM TH2F
constant
0.023659583402086008+-0.015082970337891462
chi2/ndof = 0.02265848870472831
plane
0.0822189052513862+-0.09343873504893588
invpt slope = 0.008966482381880045+-0.010034327232834494
theta slope = -0.060408679348955406+-0.07383889941338002
chi2/ndof = 0.007189042916931776
from tgraph2D
constant
0.0433972047533495+-0.0038527347676876045
chi2/ndof = 0.0016476357361332713
plane
0.13763209956314282+-0.012848184731364962
invpt slope = 0.011865270789149153+-0.0015518702028869311
theta slope = -0.11159063529821459+-0.011231676525351054
chi2/ndof = 0.0007123378342383568