/usr/share/dune-grid/grids/dgf/examplegrid2a.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.
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Interval
-1 -1 % first corner
1 1 % second corner
4 4 % 4 cells in x and 4 in y direction
#
Vertex % some additional points
0.75 0.75 % inside the interval
0.9 0.9 % also inside the interval
1.25 1.25 % and one outside of the interval
#
Simplexgenerator
display 0 % show result using Triangle viewer
% to use Triangle from a certain path, uncomment path line
%path $HOME/bin % path to Triangle
#
BOUNDARYDOMAIN
default 1 % all boundaries have id 1
#BOUNDARYDOMAIN
# examplegrid2a.dgf
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