FROM TH2F
constant
0.03618522552186312+-0.020163719093799045
chi2/ndof = 0.016996782328166708
plane
0.005538855342885424+-0.04702132972735494
invpt slope = 0.026964427403043754+-0.024127754784753413
theta slope = 0.0036699380843659194+-0.0631379689747916
chi2/ndof = 0.0026599977431518776
from tgraph2D
constant
0.05529363650464181+-0.006046161897098571
chi2/ndof = 0.00394805595843807
plane
0.0018294612252880208+-0.0031880066220529905
invpt slope = 0.03051701785529609+-0.0010014352582165447
theta slope = 0.00903097089627224+-0.00522114571422788
chi2/ndof = 0.00030738038011210146