Distances 4

#nexus

begin taxa;
  dimensions ntax=8;
  taxlabels taxon_1 taxon_2 taxon_3 taxon_4 taxon_5 taxon_6 taxon_7 taxon_8;
end;

[!
************************************************
* Non-interleaved, upper-triangular, diagonals *
************************************************
]
begin distances;
  format triangle=upper;
  matrix
    taxon_1    0  1   2   3   4   5   6   7
    taxon_2       0   8   9  10  11  12  13
    taxon_3           0  14  15  16  17  18
    taxon_4               0  19  20  21  22
    taxon_5                   0  23  24  25
    taxon_6                       0  26  27
    taxon_7                           0  28
    taxon_8                               0;
end;