FROM TH2F
constant
22.344847829560223+-0.46576847313614467
chi2/ndof = 16.07777642051233
plane
13.273149706288853+-0.9980910428703151
invpt slope = 8.011714766154082+-0.4956450226557164
theta slope = -3.99006223517174+-1.4982955052284923
chi2/ndof = 13.60645324658946
from tgraph2D
constant
34.60313020597084+-3.4263356486799075
chi2/ndof = 1397.0333439934523
plane
3.464045260391729+-5.914313032190501
invpt slope = 18.181804635432897+-2.3991210404110426
theta slope = 5.457958292964787+-8.37135997331741
chi2/ndof = 902.5245404592008