/usr/share/EMBOSS/test/data/mw3.dat is in emboss-test 6.4.0-2.
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
3.0 18.0 67.0 124.0 197.0 236.0 415.0 587.0 632.0