Comments (2)
The Z with subtract_min=True
is value of the function away from minimum. To interpret this as how many sigma: each line of the countour is n^2*up where n is number of sigma.
http://wwwasdoc.web.cern.ch/wwwasdoc/minuit/node7.html
The automatic bound is from hesse which assumes parabolic error. If your profile is not exactly parabolic then ... just enlarge your bound.
If you are gettting weird image try using
contour(x,y,z, levels=[1,4,9])
for chi^2 and contour(x,y,z, levels=[0.5,2,4.5])
for likelihood
from iminuit.
see #57
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