FROM TH2F
constant
54.151532892692074+-1.1354832504385073
chi2/ndof = 51.89727213514297
plane
63.639421362330616+-13.073986269989724
invpt slope = -26.637497407057502+-0.9810726673362041
theta slope = 41.99869844828974+-10.504329115569437
chi2/ndof = 35.2232423933911
from tgraph2D
constant
99.11420351426108+-6.0875514164910305
chi2/ndof = 1741.7392641996248
plane
29.32533900091631+-58.81774702133537
invpt slope = 8.694975293244346+-5.456262864337706
theta slope = 44.52961158776434+-46.20837383986052
chi2/ndof = 1672.6811951961793