FROM TH2F
constant
0.01616834588761771+-0.012350366995195766
chi2/ndof = 0.026125691715670047
plane
0.079255148249603+-0.08328996287841116
invpt slope = 0.007427630448315497+-0.009232116437699226
theta slope = -0.056193520665279516+-0.060832875114437655
chi2/ndof = 0.004449945583031893
from tgraph2D
constant
0.03965875958273654+-0.0025928685055783976
chi2/ndof = 0.0007596952809980327
plane
0.10347324811610517+-0.006296159302667852
invpt slope = 0.009596638595870276+-0.0008501052347916699
theta slope = -0.08012375316832042+-0.005607144993790839
chi2/ndof = 0.0002068858322945974