/usr/share/dune-grid/grids/dgf/examplegrid2c.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
min-angle 30 % quality enhancment
max-area 0.01 % area restriction
display 0 % show result using Triangle viewer
% to use Triangle from a certain path, uncomment this path line
%path $HOME/bin % path to Triangle
#
BOUNDARYDOMAIN
1 -1 -1 1 -1 % lower boundary has id 1
2 -10 -10 10 10 % all others have id 2 (could use default keyword...)
#BOUNDARYDOMAIN
# examplegrid2c.dgf
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