diff --git a/Fonderie/interpolator.c b/Fonderie/interpolator.c
index f9aaba9..9c245dc 100644
--- a/Fonderie/interpolator.c
+++ b/Fonderie/interpolator.c
@@ -66,7 +66,7 @@ fprintf(stderr, "IdxValues array at %p\n", idxvalues);
 /* compute all the needed values */
 for (idx=0; idx<nombre; idx++) {
 	filename = ptr_glob->gl_pathv[idx];
-	foo = get_float_metric_a_from_file(filename, &metrique);
+	foo = get_float_metric_from_file(filename, &metrique, method);
 	if (foo) {
 		fprintf(stderr, "%s: err %d get metric of '%s'\n", __func__,
 				foo, filename);
@@ -80,7 +80,7 @@ for (idx=0; idx<nombre; idx++) {
 
 if (method) {
 	/* and now, we can massage all our datas */
-	fprintf(stderr, "sorting %d ...\n", method);
+	// fprintf(stderr, "sorting %d ...\n", method);
 	qsort(idxvalues, nombre, sizeof(IdxValue), cmp_idxvalues);
 	}
 
@@ -91,7 +91,7 @@ if (verbosity > 1) {
 		fflush(stdout);
 		}
 	}
-
+fprintf(stderr, "\n.\n");
 return 0;
 }
 
@@ -140,6 +140,8 @@ w = iarray[0], h = iarray[1];
 fprintf(stderr, "first image size : %dx%d\n", w, h);
 
 fimg_create(&A,   w, h, 3);	pFirst  = &A;
+fimg_vdeg_a(&A, idx_values[0].value);
+
 fimg_create(&B,   w, h, 3);	pSecond = &B;
 fimg_create(&Out, w, h, 3);
 
diff --git a/Fonderie/metriques.c b/Fonderie/metriques.c
index 05e400a..c7e1cac 100644
--- a/Fonderie/metriques.c
+++ b/Fonderie/metriques.c
@@ -31,7 +31,21 @@ if (foo) {
 return 0;
 }
 /*   --------------------------------------------------------------   */
-int get_float_metric_a_from_file(char *fname, float *where)
+int get_float_metric_b(FloatImg *pimg, float *where)
+{
+int	idx, size;
+double	adder;
+
+adder = 0.0;
+size = pimg->width * pimg->height;
+for (idx=20; idx < size; idx+=42) {
+	adder += (double)pimg->R[idx];
+	}
+*where = (float)adder;
+return 0;
+}
+/*   --------------------------------------------------------------   */
+int get_float_metric_from_file(char *fname, float *where, int mode)
 {
 FloatImg	image;
 int		foo;
@@ -43,10 +57,9 @@ if (foo) {
 	return foo;
 	}
 fval = -1.0;				/* sensible default value */
-foo = get_float_metric_a(&image, &fval);
+foo = get_float_metric_b(&image, &fval);
 *where = fval;
 
-// fprintf(stderr, "metric of '%s' = %f\n", fname, fval);
 fimg_destroy(&image);
 
 return 0;
diff --git a/Fonderie/metriques.h b/Fonderie/metriques.h
index 5c76664..ce7aa81 100644
--- a/Fonderie/metriques.h
+++ b/Fonderie/metriques.h
@@ -7,6 +7,6 @@
 /*		first experiments */
 
 int get_float_metric_a(FloatImg *pimg, float *where);
-int get_float_metric_a_from_file(char *imgname, float *where);
+int get_float_metric_from_file(char *imgname, float *where, int mode);
 
 /*   --------------------------------------------------------------   */