FROM TH2F
constant
3.5269530436537644+-0.13959200703076216
chi2/ndof = 4.325465595428521
plane
9.100322897861846+-0.4320568394760205
invpt slope = -1.6140539581498274+-0.08357247826498321
theta slope = 1.6912274590283018+-0.5711359248403777
chi2/ndof = 1.923418601250394
from tgraph2D
constant
7.7345588493617345+-0.17445248427949647
chi2/ndof = 6.056300201000814
plane
4.201495706711501+-0.2939573699166302
invpt slope = 0.13255735678502284+-0.07114394888191392
theta slope = 4.709336480353324+-0.33832319938614247
chi2/ndof = 2.9577050804701375