diff --git a/test/unison/Makefile b/test/unison/Makefile
index 07e1a5062169f6ec57dc7b19028b889469c2a75d..89f5926a4a28d9c59ba2ad2a04e7f1f3573591cd 100644
--- a/test/unison/Makefile
+++ b/test/unison/Makefile
@@ -1,8 +1,12 @@
-# Time-stamp: <modified the 07/03/2019 (at 14:29) by Erwan>
-
+# Time-stamp: <modified the 07/03/2019 (at 16:38) by Erwan>
 
 test: unison.cmxs 
+	$(sasa) -l 200 fig4.1.dot 
+
+test2: unison.cmxs 
 	$(sasa) -l 200 ring.dot 
 
+
+
 -include ../Makefile.inc
 
diff --git a/test/unison/fig4.1.dot b/test/unison/fig4.1.dot
new file mode 100644
index 0000000000000000000000000000000000000000..c92dd939a303b3e503c5193b898dcdddc158b7af
--- /dev/null
+++ b/test/unison/fig4.1.dot
@@ -0,0 +1,16 @@
+graph fig4_1 {
+
+ p1 [algo="unison.cmxs"]
+ p2 [algo="unison.cmxs" ]
+ p3 [algo="unison.cmxs"]
+ p4 [algo="unison.cmxs"]
+ p5 [algo="unison.cmxs"]
+ p6 [algo="unison.cmxs"]
+ p7 [algo="unison.cmxs"]
+ p8 [algo="unison.cmxs"]
+
+ p1 -- p2 -- p3 -- p4 -- p5 -- p3
+ p2 -- p7 -- p6 -- p3
+ p7 -- p8 -- p6
+ 
+}