FROM TH2F
constant
3.945119408218701+-0.2278364891924655
chi2/ndof = 0.4128707371205581
plane
4.415065234315375+-0.63442794902236
invpt slope = -0.7116395991822633+-0.35312240116827914
theta slope = 0.7161241585166587+-0.6517463310117468
chi2/ndof = 0.3501667744874302
from tgraph2D
constant
4.834431088395201+-0.2801357351073767
chi2/ndof = 7.298270807966405
plane
5.164915502895041+-0.513123107542527
invpt slope = -1.7033274364521895+-0.2977253255475161
theta slope = 2.211014595595311+-0.6451780199602869
chi2/ndof = 5.068685618641504