FROM TH2F
constant
0.020855942219991486+-0.023125045931014266
chi2/ndof = 0.008572887306243891
plane
-0.01524989557079906+-0.17680895627561516
invpt slope = 0.008595385219525294+-0.026050961332822038
theta slope = 0.02392090506111749+-0.15791254550981007
chi2/ndof = 0.00602212712577577
from tgraph2D
constant
0.027117016198428125+-0.0022184480431299506
chi2/ndof = 0.00021162500396210214
plane
0.008066108660078604+-0.012458357512618456
invpt slope = 0.01021840081527299+-0.0014427727629493848
theta slope = 0.0027741953084916907+-0.011708485316148126
chi2/ndof = 9.604487220777857e-05