FROM TH2F
constant
6.148884206662311+-0.26138273794821976
chi2/ndof = 0.8288579861364549
plane
9.148700390996721+-0.7529322223712094
invpt slope = -1.7519885433697977+-0.2849227625362126
theta slope = 0.16884682714655597+-0.8349348567540877
chi2/ndof = 0.40912680887589276
from tgraph2D
constant
7.14695425072501+-0.21190701308040732
chi2/ndof = 4.759885710027784
plane
8.471670519392388+-0.38638067222890365
invpt slope = -1.3044152580321002+-0.16908209949991587
theta slope = 0.6547049264987481+-0.5228106350446406
chi2/ndof = 3.0623415585195537