FROM TH2F
constant
14.312962958746331+-0.3944308364385973
chi2/ndof = 57.09383689832138
plane
14.612814290365787+-1.2176178209188724
invpt slope = -11.056233590676964+-0.5493166293795713
theta slope = 24.552069305449933+-1.6821091729615882
chi2/ndof = 53.78282173659635
from tgraph2D
constant
73.72431779066564+-3.8965843555209942
chi2/ndof = 1518.3369670246186
plane
81.12297927992225+-17.652138037649163
invpt slope = -9.695289444331532+-2.9051204529734544
theta slope = 9.697017187276295+-15.512828290242487
chi2/ndof = 1388.3440690584473