Point(1) = {0.0, 0.0, 0.0, .5};
Point(2) = {1.0, 0.0, 0.0, .5};
Point(3) = {0.0, 1.0, 0.0, .5};
Point(4) = {1.0, 1.0, 0.0, .5};

Line(1) = {1, 2};
Line(2) = {2, 4};
Line(3) = {4, 3};
Line(4) = {3, 1};
Line Loop(1) = {1, 2, 3, 4};
Plane Surface(1) = {1};