/usr/share/dune-grid/grids/gmsh/circle.geo 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 | // mesh width associated with points
lc = 1;
// Two antipodal points on the circle, the third point is the circle center
Point(1) = {-1, 0, 0, lc};
Point(2) = {1, 0, 0, lc};
Point(3) = {0, 0, 0, lc};
Circle(1) = {1,3,2};
Circle(2) = {2,3,1};
Line Loop(100) = {1,2};
Plane Surface(200) = {100};
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