FROM TH2F
constant
17.995531853603495+-0.41597350950570294
chi2/ndof = 24.416104034807088
plane
29.18597356109211+-2.6343072159661487
invpt slope = -7.593655100050444+-0.2406949785926454
theta slope = 26.43283073994089+-2.1160552439520237
chi2/ndof = 13.393915637604048
from tgraph2D
constant
41.69142626509475+-2.380211000392939
chi2/ndof = 611.8636768073104
plane
79.65466263433049+-13.818765275737723
invpt slope = -6.361635289583089+-0.9714802356973459
theta slope = -12.30660394801751+-11.360391284303887
chi2/ndof = 441.88324366977855