FROM TH2F
constant
0.036568439390008284+-0.013227570061573537
chi2/ndof = 0.031372883466303854
plane
-0.0010846160046608638+-0.029404644036126533
invpt slope = 0.019399560475611543+-0.00815140360471675
theta slope = 0.006693801306527136+-0.037239326350011676
chi2/ndof = 0.003181372759809451
from tgraph2D
constant
0.06297702168491429+-0.0030691390260869254
chi2/ndof = 0.002138252458356496
plane
-0.003800352329262037+-0.002165372181582515
invpt slope = 0.021744343159652214+-0.0004365018512754465
theta slope = 0.005677258044446439+-0.002470433958139595
chi2/ndof = 0.0001739779685894913