FROM TH2F
constant
45.835877761208614+-0.8333564648738383
chi2/ndof = 6.988312990090343
plane
16.85580641595969+-4.378264227415675
invpt slope = 2.5346098342131818+-0.7817557111054058
theta slope = 21.042782068433546+-3.6284685734939326
chi2/ndof = 6.446307323928023
from tgraph2D
constant
52.33929394276327+-2.5026090560008614
chi2/ndof = 450.93975055558076
plane
24.857140538291063+-14.658603235127211
invpt slope = 2.68440279482404+-2.0563092480142626
theta slope = 19.25881389200935+-12.084218805717622
chi2/ndof = 434.95269824508404