See Marazzi A. (1993), p.87
wyfcol(x, exu = ucv, nobs = nrow(x), iwgt = .dFvGet()$iwg,
apar = .dFvGet()$apr, tau = .dFvGet()$tua,
tol = .dFvGet()$tlo, maxit = .dFvGet()$mxf,
nitmon = .dFvGet()$ntm, icnv = .dFvGet()$icv)
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See reference
Marazzi A. (1993) Algorithm, Routines, and S functions for Robust Statistics. Wadsworth & Brooks/cole, Pacific Grove, California. p.8