FROM TH2F
constant
25.32651830339442+-0.49348172653618944
chi2/ndof = 18.934669006404835
plane
56.59265672464559+-3.171495816306337
invpt slope = -6.908082358857254+-0.24049293193892035
theta slope = 2.625748244517517+-2.668047948035422
chi2/ndof = 11.120566961128446
from tgraph2D
constant
43.66716485405475+-2.243492999081672
chi2/ndof = 543.5921727961534
plane
122.9350034876237+-12.725931740161082
invpt slope = -5.685242712690678+-0.8864900376109145
theta slope = -52.12615079842653+-10.491462245995987
chi2/ndof = 355.1459456727859