FROM TH2F
constant
5.149378920148566+-0.13708885342442664
chi2/ndof = 24.883293188159747
plane
27.84568619252131+-0.7109686070004023
invpt slope = -6.017871811410302+-0.10082995551569379
theta slope = 15.717270060821855+-0.8128728991352809
chi2/ndof = 11.199098470635874
from tgraph2D
constant
30.707041924668722+-0.9727765802504004
chi2/ndof = 281.0493986414888
plane
32.40837109702719+-2.0441810459196104
invpt slope = -2.978476586277936+-0.3595623169983272
theta slope = 10.40756494766132+-2.242649392938961
chi2/ndof = 228.1495431171776