FROM TH2F
constant
10.452061567142003+-0.375824527114466
chi2/ndof = 22.350917948142868
plane
-0.35992500205561573+-0.9710201410558263
invpt slope = 6.565137496258975+-0.5925142687356333
theta slope = 8.433775855637556+-1.0571902485374525
chi2/ndof = 20.844882670274874
from tgraph2D
constant
28.71895700779005+-4.780987214494548
chi2/ndof = 2080.0633240570473
plane
-24.738684755870562+-8.307792058185989
invpt slope = 19.701364057144772+-4.714172117461498
theta slope = 60.498082976686625+-10.864687299481362
chi2/ndof = 1331.207811994793