FROM TH2F
constant
17.657540122303324+-0.5058718993850492
chi2/ndof = 58.06354635027579
plane
-39.53341385052193+-2.2385645405343975
invpt slope = -29.277673389943146+-0.5935895636095061
theta slope = 137.33866838191713+-3.147243002190459
chi2/ndof = 22.272910804088433
from tgraph2D
constant
75.5396891337952+-4.894485072843388
chi2/ndof = 1820.654794025179
plane
-50.40918073922093+-22.779582002199717
invpt slope = -13.661533436150187+-2.858810342456226
theta slope = 135.9642328195162+-21.33455624331973
chi2/ndof = 1126.6094542615808