circularSegments = 13;
Point(1) = {0.025, 0.0, -0.1, 1};
Extrude {{0, 0, 1}, {0, 0, -0.1}, Pi/2} {
  Point{1};
}
Extrude {{0, 0, 1}, {0, 0, -0.1}, Pi/2} {
  Point{2};
}
Extrude {{0, 0, 1}, {0, 0, -0.1}, Pi/2} {
  Point{4};
}
Extrude {{0, 0, 1}, {0, 0, -0.1}, Pi/2} {
  Point{5};
}
Transfinite Line {1,2,3,4} = circularSegments Using Progression 1;
Line Loop(1) = {-1,-2,-3,-4};
Plane Surface(4) = {1};

