diff --git a/core/utils.c b/core/utils.c
index 17cf615..90049c6 100644
--- a/core/utils.c
+++ b/core/utils.c
@@ -23,7 +23,7 @@ return v1 ^ v2;
 /* --------------------------------------------------------------- */
 int random1000(int type)
 {
-int         value;
+int         value, foo;
 
 #if DEBUG_LEVEL > 1
 fprintf(stderr, ">>> %s(%d)\n", __func__, type);
@@ -36,6 +36,12 @@ switch (type) {
 	case 1:
 		value = (rand()%1000 + rand()%1000) / 2;
 		break;
+	case 4:
+		value = 0;
+		for (foo=0; foo<4; foo++)
+			value += rand() % 1000;
+		value /= 4;
+		break;
 	default:
 		value = -1;
 		break;
diff --git a/exemple.sh b/exemple.sh
index 80b52ae..3e1824a 100755
--- a/exemple.sh
+++ b/exemple.sh
@@ -6,21 +6,28 @@ DATAFILE=/tmp/fake-datafile
 > ${DATAFILE}
 for s in $(seq 1 2000)
 do
-    v=$(./fake-values -s -t 1)
+    v=$(./fake-values -s -t 4)
     echo $s $v >> ${DATAFILE}
 done
 
+tail -5 ${DATAFILE}
+
 #-----  do dome useless computations
 awk	'
-	NR==1	{ debut = $2 }
+	NR==1	{
+		debut = $2
+		}
+		
 		{
 		# print $2-debut, $3
-		v = int($3/25);
+		v = int($3/35);
 		bucket[v]++;
 		}
+		
 	END	{
 		for (v=0; v<40; v++) {
-			for (foo=0; foo<bucket[v]; foo++) {
+			printf "%4d ", v;
+			for (foo=0; foo<bucket[v]/2; foo++) {
 				printf "-";
 				}
 			print "*"
diff --git a/fake-values.c b/fake-values.c
index b536d79..1bb7ba8 100644
--- a/fake-values.c
+++ b/fake-values.c
@@ -1,5 +1,7 @@
 /*
  *		fake-values.c
+ *		-------------
+ *		useless software
  */
 
 #include  <stdio.h>
@@ -30,7 +32,7 @@ if (verbosity > 1) {
 	fprintf(stderr, "fake values - %s %s\n", __DATE__, __TIME__);
 	}
 
-printf("%f %d\n", dtime(), random1000(type));
+printf("%.3f %d\n", dtime(), random1000(type));
 
 return 0;
 }