FROM TH2F
constant
24.481983357182358+-0.6137148344096542
chi2/ndof = 41.45885255955389
plane
-64.57325761302423+-5.9777504966071735
invpt slope = -1.8538267048480948+-0.24543730185333756
theta slope = 79.43070661546002+-4.86161132603322
chi2/ndof = 37.50886532946092
from tgraph2D
constant
64.70473653385454+-4.734168008637639
chi2/ndof = 1658.5136573498207
plane
-172.43970684395927+-38.89175020070621
invpt slope = 3.668501638062623+-1.3946225140875568
theta slope = 180.47883154472697+-29.541651019032273
chi2/ndof = 1114.9947599522436