FROM TH2F
constant
8.057921642929418+-0.448829634709635
chi2/ndof = 9.303905465859655
plane
11.244346905368268+-3.1898151095429004
invpt slope = -1.2204986701302492+-0.4376001155987568
theta slope = -1.1312210725648022+-3.042696068426973
chi2/ndof = 9.595560259307
from tgraph2D
constant
19.591870633315466+-3.5128030106047223
chi2/ndof = 555.2903245950451
plane
90.85742073035678+-24.34311870006236
invpt slope = -2.8419389686902505+-3.3153284846118174
theta slope = -69.93769402524099+-23.92204323666738
chi2/ndof = 481.52537904036024