FROM TH2F
constant
18.074443794691685+-0.5785429307959639
chi2/ndof = 59.176512184156074
plane
-33.93554930920972+-5.576218770857378
invpt slope = -23.925926848579554+-0.6531223290545174
theta slope = 111.16986217886657+-5.666323847531281
chi2/ndof = 32.86205107499107
from tgraph2D
constant
77.89491719468796+-6.718314052506304
chi2/ndof = 2663.0088743963806
plane
39.455484471086834+-57.00102159099934
invpt slope = -13.489816693557167+-4.335787944917705
theta slope = 55.27300856307877+-48.94171959322806
chi2/ndof = 2346.95553803607