Set the minimization method.
XSPEC> method <algorithm> [<# of trials/evaluations> [<critical delta> [<start temperature> [<temperature reduction factor>]]]]
where <algorithm> is the method in use and the other arguments are control values for the minimization. Their meanings are explained under the individual methods. Note that all but Lev-Marq and Anneal require the MINUIT library from CERN to be linked into XSPEC. If any of the MINUIT library methods are set then the error command will use the MINUIT MINOS command to find the confidence regions.