diff --git a/demo/circulation-input.lgf b/demo/circulation-input.lgf
new file mode 100644
--- /dev/null
+++ b/demo/circulation-input.lgf
@@ -0,0 +1,32 @@
+@nodes 
+coordinates_x   coordinates_y   delta   label   
+-396.638        -311.798        0       0       
+154.409         -214.714        13      1       
+-378.119        -135.808        0       2       
+-138.182        -58.0452        0       3       
+55              -76.1018        0       4       
+-167.302        169.88          0       5       
+71.6876         38.7452         0       6       
+-328.784        257.777         0       7       
+354.242         67.9628         -13     8       
+147             266             0       9       
+@edges 
+                label   lo_cap  up_cap  
+0       1       0       0       20      
+0       2       1       0       0       
+1       1       2       0       3       
+1       2       3       0       8       
+1       3       4       0       8       
+2       5       5       0       5       
+3       2       6       0       5       
+3       5       7       0       5       
+3       6       8       0       5       
+4       3       9       0       3       
+5       7       10      0       3       
+5       6       11      0       10      
+5       8       12      0       10      
+6       8       13      0       8       
+8       9       14      0       20      
+8       1       15      0       5       
+9       5       16      0       5       
+@end