FROM TH2F
constant
31.829271268503636+-0.7283459714443655
chi2/ndof = 74.40303072507437
plane
-30.069954623169494+-2.6018572761717302
invpt slope = -6.463199062762385+-0.6167163670760294
theta slope = 76.7926876050156+-2.9989705440623275
chi2/ndof = 65.38241565331009
from tgraph2D
constant
103.66272889390736+-7.221275671807353
chi2/ndof = 3441.690273885688
plane
-50.073747559834615+-31.837503303773136
invpt slope = -12.290468212539766+-5.016725725148733
theta slope = 157.31246639022913+-29.53683470544871
chi2/ndof = 2425.024293844284