The file matrix must contain a symmetric distance matrix. Assuming that there are N hosts, with IDs 0,1,...,N-1, then the first line has distances 0 to 0, 0 to 1, 0 to 2, etc; the second line has distances 1 to 0, 1 to 1, 1 to 2, etc.

The file combined has N+1 columns, each line corresponds to one target host. The first column is the IP address of the target. The following N columns are the distances between the target and the N measurement hosts in matrix, from ID 0 to N-1. If the symmetric mode is used, this file may be empty.