FROM TH2F
constant
19.16627886697071+-0.5309021020573917
chi2/ndof = 61.453938992851306
plane
-25.770447771330982+-3.732235614834944
invpt slope = -10.752643824855582+-0.3760314539738659
theta slope = 67.32856801885768+-3.6685971872000898
chi2/ndof = 50.76488242749346
from tgraph2D
constant
79.44899872364795+-5.722798120773166
chi2/ndof = 2423.530956355865
plane
1.4032140167424831+-38.8331455895923
invpt slope = -0.40340140093336024+-4.104329537036569
theta slope = 66.26598940502645+-31.88652875410197
chi2/ndof = 2348.9159503406577