FROM TH2F
constant
19.140370187581414+-0.5155952631746924
chi2/ndof = 50.32534770521093
plane
-38.25910013532455+-2.474002158777911
invpt slope = -22.344479264140524+-0.4548268861738837
theta slope = 123.77915099365924+-3.13265437779954
chi2/ndof = 16.56193856431
from tgraph2D
constant
73.94881467300746+-5.0599690631934
chi2/ndof = 2022.659663928345
plane
2.1353687315117824+-18.792855930051672
invpt slope = -23.361457273675345+-2.694222130391641
theta slope = 103.9159905779886+-18.087005580804668
chi2/ndof = 997.3014301576866