FROM TH2F
constant
23.885321584203357+-0.5464124083971388
chi2/ndof = 26.014167259436597
plane
83.38809707127982+-2.652864131284989
invpt slope = -1.1812432629664409+-0.4684088497958771
theta slope = -45.71717409309845+-2.117909039276248
chi2/ndof = 19.86399409220194
from tgraph2D
constant
47.08229512338957+-2.761416187515085
chi2/ndof = 671.0369047312736
plane
43.2354575514913+-11.610208220542031
invpt slope = 10.132458041128585+-2.1365209144707076
theta slope = -11.407399945322066+-10.41746316301824
chi2/ndof = 543.1013689719532