FROM TH2F
constant
0.03016887983562487+-0.025609475071323898
chi2/ndof = 0.012952044981095215
plane
0.06664232623597897+-0.14285766967088243
invpt slope = 0.011712633941649524+-0.034684460358134925
theta slope = -0.05260031489720187+-0.14246122788587667
chi2/ndof = 0.006439459910565352
from tgraph2D
constant
0.03903753287968917+-0.0039190997434547185
chi2/ndof = 0.0007986858255545035
plane
0.09390367186291962+-0.012406946999021746
invpt slope = 0.014391297025836728+-0.003133785141924167
theta slope = -0.08229520571284063+-0.01280018376971159
chi2/ndof = 0.0003185844401010223