"Two Degrees of Freedom Controller Design for an Ill-conditioned Distillation Process Using mu-synthesis" by H. Petter Lundstrom, Sigurd Skogestad and John C. Doyle, This version is from January 1998. It is slightly different from the one finally publsished in IEEE Trans. on Control System Technoligy, Vol. 7, Jan. 1999, 12-21. It contains also the D-scales for TDF-ALT.1 design which are missing from Table III in the printed version.