= true;
            coarseGrid{1}.apertureType = 'constants';
            fineGrid = cell(2,1);
            fineGrid{2} = fset{2};
            fineGrid{1} = fset{3};
        case 2 % the Cartesian grid is used as constraints for the coarse dual grid
            coarseGrid = cell(1,1);
            coarseGrid{1} = fset{3};
            coarseGrid{1}.merge = true;
            coarseGrid{1}.apertureType = 'constants';
            fineGrid = cell(2,1);
            fineGrid{1} = fset{1};
            fineGrid{2} = 