FROM TH2F
constant
7.47321976596085+-0.7058432200543553
chi2/ndof = 0.7619074958157416
plane
25.031788078883753+-10.286060095653536
invpt slope = -2.9889040106479134+-1.4947047258125035
theta slope = -12.578404400052554+-8.294310075846274
chi2/ndof = 0.5125960538111228
from tgraph2D
constant
8.358611236888972+-0.4591182044028653
chi2/ndof = 3.794211463859218
plane
15.324512634014567+-5.529540791729926
invpt slope = -1.9492817507376832+-0.6012456793620276
theta slope = -4.739924161530896+-4.646868591874608
chi2/ndof = 2.5160145433668193