FROM TH2F
constant
0.02254820934645761+-0.019070416765717024
chi2/ndof = 0.016631867106709233
plane
0.09751746077681864+-0.13989399219336818
invpt slope = 0.009844101350683147+-0.018714572889244552
theta slope = -0.07502989675054356+-0.11377184485927955
chi2/ndof = 0.003892944813201539
from tgraph2D
constant
0.0367352645705753+-0.003473129988752444
chi2/ndof = 0.0007961337065833576
plane
0.13334204851387002+-0.008862427895210696
invpt slope = 0.010639562745517129+-0.001507246726379776
theta slope = -0.106211894011331+-0.007655657055672828
chi2/ndof = 0.00016882777001598996