FROM TH2F
constant
0.01665547562391644+-0.019238546735361142
chi2/ndof = 0.007965955842602191
plane
0.045723904274610185+-0.17417436892895458
invpt slope = 0.009854585322699009+-0.020160942531922004
theta slope = -0.03377608474756198+-0.14154895217431224
chi2/ndof = 0.0010531123101440991
from tgraph2D
constant
0.022294611640029015+-0.0020843217974790716
chi2/ndof = 0.0002172198677724601
plane
0.050313843841192404+-0.007833272766961016
invpt slope = 0.011054071772921965+-0.0008772927708975397
theta slope = -0.03864587134238682+-0.006612186565835147
chi2/ndof = 4.517817792805305e-05