FROM TH2F
constant
47.29914167352485+-0.6809677486287361
chi2/ndof = 19.926524135430203
plane
13.21132282326456+-3.351515133803884
invpt slope = -0.7465674542456735+-0.4497799733683314
theta slope = 34.67557520527458+-2.8484401404017623
chi2/ndof = 18.752677913841513
from tgraph2D
constant
64.31079233971363+-3.1857444493341838
chi2/ndof = 1106.2374804191397
plane
42.984124385581+-15.932883481612206
invpt slope = 2.6318933770020374+-1.9573876160616115
theta slope = 13.894566585308702+-14.074198301247657
chi2/ndof = 1095.8228759073052