FROM TH2F
constant
14.500073191780194+-0.5088515288749876
chi2/ndof = 6.572872855058877
plane
12.957002198010992+-1.1844346300657913
invpt slope = -0.9223117465201536+-0.7527244883593105
theta slope = 5.142883352024887+-1.8693504465850797
chi2/ndof = 6.669974967742513
from tgraph2D
constant
19.605681095423513+-1.8735452342343655
chi2/ndof = 249.22219377446095
plane
7.644405606097329+-3.6860940891246297
invpt slope = 6.596209893633158+-2.4626880870375327
theta slope = 13.849594029038983+-5.596986998938338
chi2/ndof = 212.61953965414418