diff --git a/example/data/d_003.m b/example/data/d_003.m
new file mode 100644
index 0000000..6ccaebf
--- /dev/null
+++ b/example/data/d_003.m
@@ -0,0 +1,48 @@
+% 3-bus test system                        
+
+Bus.con = [ ...
+   1  100.00  1.00000  0.00000  1  1;
+   2  100.00  1.00000 -0.09646  1  1;
+   3  100.00  1.00000 -0.13938  1  1;
+  ];
+
+SW.con = [ ...
+    2 100.0 100.00  1.00000  0.00000 99.00000 -99.00000 1.1 0.9  0 1 1 1;
+  ];
+
+PV.con = [ ...
+    3 100.0 100.00  0.50000  1.00000  0.20000 -0.10000 1.1 0.9 1  1;
+  ];
+
+PQ.con = [ ...
+   1 100.0 100.00  1.00000  0.20000 2.0 0.0 0  1;
+  ];
+
+Shunt.con = [ ...
+  1 100.0 100.00 60  0.00000  0.19000  1;
+  3 100.0 100.00 60  0.00000  0.04300  1;
+  ];
+
+Line.con = [ ...
+   1    2  100.00 100.00 60 0   0.0000  0.01920  0.20000  0.05280  0.00000  0.00000 1.000    0.000    0.000  1;
+   1    3  100.00 100.00 60 0   0.0000  0.04520  0.20000  0.04080  0.00000  0.00000 1.000    0.000    0.000  1;
+   2    3  100.00 100.00 60 0   0.0000  0.05700  0.20000  0.03680  0.00000  0.00000 1.000    0.000    0.000  1;
+  ];
+
+Ltc.con=[ ...
+];
+
+Demand.con = [ ... 
+ ];
+
+Supply.con = [ ...  
+];
+
+Ind.con = [...
+];
+
+
+
+Bus.names = { ...
+  'bus-1 '; 'bus-2 '; 'bus-3 '};
+