/usr/share/dune-grid/grids/dgf/octahedron.dgf is in libdune-grid-dev 2.5.1-1.
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 17 18 19 20 21 22 23 24 | DGF
% This DGF files models the unit octahedron.
% Note that this octahedron is borderless, so boundary ids do not make sense.
VERTEX
1 0 0
0 1 0
-1 0 0
0 -1 0
0 0 1
0 0 -1
#
SIMPLEX
0 3 4
0 1 4
1 2 4
2 3 4
0 3 5
0 1 5
1 2 5
2 3 5
#
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