I have a very simple square geometry defined in GMSH as
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//+
Point(1) = {-3, 3, 0, 1.0};
//+
Point(2) = {-3, -3, 0, 1.0};
//+
Point(3) = {3, -3, 0, 1.0};
//+
Point(4) = {3, 3, 0, 1.0};
//+
Line(1) = {1, 2};
//+
Line(2) = {2, 3};
//+
Line(3) = {3, 4};
//+
Line(4) = {4, 1};
//+
Line Loop(5) = {1, 2, 3, 4};
//+
Plane Surface(6) = {5};
With regards,
Estiivan