It covers that part of Minuit functionality, which is not provided by the NAG C library and which is seen as indispensable by the physics community.
Error estimates for the general minimizers.
Bound constrained nonlinear least squares. Elliptical confidence regions for a selected pair of parameters. These are standard confidence regions based on inverted Hessian. For a selected pair of parameters and with the remaining parameters fixed, this routine shall return a user defined number of consecutive points from the contour corresponding to a given function value.