
                to NSMIN;
          = 2:  with ORDSEL = 'F', the selected order NR corresponds
                to repeated singular values for the ALPHA-stable
                part, which are neither all included nor all
                excluded from the reduced model; in this case, the
                resulting NR is automatically decreased to exclude
                all repeated singular values;
          = 3:  with ORDSEL = 'F', the selected order NR is less
                than the order of the ALPHA-u