FROM TH2F
constant
40.45166901030786+-0.8210934681517698
chi2/ndof = 65.89711822301122
plane
-116.00750820743794+-3.2753845985849295
invpt slope = -7.446742563355123+-1.096931746509495
theta slope = 198.57968358843974+-3.722023578388308
chi2/ndof = 16.973899910890214
from tgraph2D
constant
106.06848647970563+-6.313147541153666
chi2/ndof = 2630.4849003273393
plane
-104.14303242947138+-22.55323952064175
invpt slope = 0.10579646961951594+-3.5634460256873686
theta slope = 190.55320713808078+-20.616308335970913
chi2/ndof = 1117.9555578736358