diff --git a/lib/fimg-math.c b/lib/fimg-math.c
index a1ec02dc..4cab2443 100644
--- a/lib/fimg-math.c
+++ b/lib/fimg-math.c
@@ -181,6 +181,9 @@ if (fi->count < 1) {
 	return -98;
 	}
 
+/*
+ *		mmmm, is this real ?
+ */
 coef = 1.0 / ((double)fi->count * (double)fi->fval);
 
 if (verbosity) {
diff --git a/lib/t.c b/lib/t.c
index 95ac90de..79987bea 100644
--- a/lib/t.c
+++ b/lib/t.c
@@ -147,6 +147,11 @@ maxi = (double)fimg_get_maxvalue(&copy);
 fprintf(stderr, "apres  cos 01       valeur maxi = %f\n", maxi);
 fimg_dump_to_file(&copy, "cos_01.fimg", 0);
 
+fimg_cos_010(&dessin, &copy, maxi);
+maxi = (double)fimg_get_maxvalue(&copy);
+fprintf(stderr, "apres  cos 010      valeur maxi = %f\n", maxi);
+fimg_dump_to_file(&copy, "cos_010.fimg", 0);
+
 fimg_destroy(&dessin);
 
 return -1;