//
SetFactory("OpenCASCADE");
a = 1;
Mesh.CharacteristicLengthMax = a/2;

Rectangle(1) = {-a/2, -a/2, 0, a, a};
Rectangle(2) = {+a/2, -a/2, 0, a, a};
Physical Surface(1) = {2};

RenumberMeshNodes;
RenumberMeshElements;
