FROM TH2F
constant
17.381373610460088+-0.49830245547748203
chi2/ndof = 11.469534133571912
plane
3.195970430342846+-1.1307977808854288
invpt slope = 9.8274413859998+-0.6696818402449738
theta slope = 9.781951184845447+-1.7609027879505723
chi2/ndof = 7.958388164427779
from tgraph2D
constant
25.06323437968772+-2.929376889581071
chi2/ndof = 729.4061615062807
plane
-2.1813728459248103+-4.609990663481747
invpt slope = 20.97474997555929+-2.404007250677101
theta slope = 9.947876171140088+-7.045599971576822
chi2/ndof = 375.29996257198263