terium Default: 1e-10
  xtol*: cdouble             ## Relative parameter convergence criterium  Default: 1e-10
  gtol*: cdouble             ## Orthogonality convergence criterium       Default: 1e-10
  epsfcn*: cdouble           ## Finite derivative step size               Default: MP_MACHEP0
  stepfactor*: cdouble       ## Initial step bound                     Default: 100.0
  covtol*: cdouble           ## Range tolerance for covariance calculation Default: 1e-14
  maxiter*: cint ## Maximum number of iter