/usr/share/circos/tools/matrix/matrix.txt is in circos-tools 0.22-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # 3 x 5 matrix
r1 c1 11
r2 c1 21
r3 c1 31
r1 c2 12
r2 c2 22
r3 c2 32
r1 c3 13
r2 c3 23
r3 c3 33
r1 c4 14
r2 c4 24
r3 c4 34
r1 c5 15
r2 c5 25
r3 c5 35
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