30   MatStencil     lower, upper;                  /* Stencils to select slice */  in main()  local
92     lower.i = sliceid;  in main()
93     lower.j = 0;  in main()
94     lower.k = 0;  in main()
95     lower.c = 1;  in main()
101     lower.i = 0;  in main()
102     lower.j = sliceid;  in main()
103     lower.k = 0;  in main()
104     lower.c = 1;  in main()
110     lower.i = 0;  in main()
111     lower.j = 0;  in main()
112     lower.k = sliceid;  in main()
113     lower.c = 1;  in main()
119   PetscCall(DMDACreatePatchIS(da, &lower, &upper, &selectis, patchis_offproc));  in main()