diff --git a/src/graphics/arrows.c b/src/graphics/arrows.c
index b039c58..9fde53b 100644
--- a/src/graphics/arrows.c
+++ b/src/graphics/arrows.c
@@ -71,11 +71,11 @@ int write_one_arrow_vertex (int space_X_int, int space_Y_int, int space_Z_int,
         graphics_write_color(0.6f, 0.1f, 0.7f);
         break;
     case SOUTH:
-        graphics_write_vertex (vx, vy, vz + (site % 2 - 1) * (1 / max) - (site % 2 - 1) * arrow_tip_padding, print);
+        graphics_write_vertex (vx, vy, vz - (site % 2 - 1) * (1 / max) + (site % 2 - 1) * arrow_tip_padding, print);
         graphics_write_color(0.05f, 0.4f, 1.0f);
         break;
     case NORTH:
-        graphics_write_vertex (vx, vy, vz + (site % 2) * (1 / max) - (site % 2) * arrow_tip_padding, print);
+        graphics_write_vertex (vx, vy, vz - (site % 2) * (1 / max) + (site % 2) * arrow_tip_padding, print);
         graphics_write_color(1.0f, 1.0f, 0.0f);
         break;
     default: break;
diff --git a/src/graphics/displays.c b/src/graphics/displays.c
index 394b588..ba3d847 100644
--- a/src/graphics/displays.c
+++ b/src/graphics/displays.c
@@ -135,6 +135,7 @@ void print_arrows_array (struct arrow_t *arrows, int arrows_nb, int invoked_by)
     case 4: printf("address == -1 && requested_weight == 0)"); break;
     case 5: printf("print_user_choices)"); break;
     case 6: printf("print_evolution)"); break;
+    case 7: printf("before deletion)"); break;
     }
     for (int i = 0; i < arrows_nb; i++)
         printf("\n   [%4d] =  %2d  | %2d,  %2d,  %2d,  %2d", i, arrows[i].load,\
@@ -154,7 +155,7 @@ void print_user_choices(struct arrow_t *arrows, int max_arrows_nb, int arrows_nb
                         int space_size_x, int space_size_y, int space_size_z,
                         int show_array, int show_space_design)
 {
-    printf("model + user constraints :\tspace size x,y,z (%d,%d,%d)\t\tarrows nb : %d  >  %d\t",\
+    printf("model + user constraints :\tspace size x,y,z (%d,%d,%d)\tinitial (max) arrows nb : %d  >>  %d\t",\
            space_size_x, space_size_y, space_size_z, max_arrows_nb, arrows_nb);
 
     if (show_space_design)      printf(" (grilles alternées)");
diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index d4decf8..31e9f63 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -679,7 +679,7 @@ static inline int erase_arrow (int arrows_nb, int arrow_address_in_list,
     if (arrows_nb == 0) assert (buffer_lines_size == buffer_lines_0_arrow); //   ?
     if (arrows_nb == 0) {buffer_lines_size = buffer_lines_0_arrow; return 0;}
 
-    if (1) print_arrows_array (arrows_ptr, arrows_nb, 0);
+    if (1) print_arrows_array (arrows_ptr, arrows_nb, 7);
 
     assert (arrows_nb);
     arrows_nb --;
@@ -724,7 +724,7 @@ static inline int erase_arrow (int arrows_nb, int arrow_address_in_list,
             buffer_colors_origin [buffer_colors_0_arrow + i] = buffer_colors_origin [buffer_colors_size - 6 + i];
     }
 
-    if (console) print_arrows_array (arrows_ptr, arrows_nb, 0);
+    if (1) print_arrows_array (arrows_ptr, arrows_nb, 0);
 
     return arrows_nb;
 }
@@ -797,9 +797,11 @@ void main_test_graphics (void)
                                rand() % space_Z,    //    z
                                console);
     else for (int i = 0; i < 6; i++)
-        arrows_nb = set_arrow (arrows_ptr, arrows_nb, 1, 1, 1, 1, i, 0, 0, 0, 1);
+        arrows_nb = set_arrow (arrows_ptr, arrows_nb, 1, 1, 1, 1, i, 0, 0, 0, 0);
     int max_arrows_nb = arrows_nb;
 
+    if (randomize); print_user_choices(arrows_ptr, max_arrows_nb, arrows_nb, space_X, space_Y, space_Z, 0, 0);
+
     if (randomize) for (int i = 0; i < specified_arrows_nb * 6; i++)
         arrows_nb = set_arrow (arrows_ptr, arrows_nb, space_X, space_Y, space_Z,
                                0,                   //    load
@@ -808,10 +810,10 @@ void main_test_graphics (void)
                                rand() % space_Y,    //    y
                                rand() % space_Z,    //    z
                                console);
-    else for (int i = 0; i < 6; i++)
-        arrows_nb = set_arrow (arrows_ptr, arrows_nb, 1, 1, 1, 0, i, 0, 0, 0, 1);
+   else for (int i = 0; i < 1; i++)
+        arrows_nb = set_arrow (arrows_ptr, arrows_nb, 1, 1, 1, 0, i, 0, 0, 0, 0);
 
-    if (randomize || 1) print_user_choices(arrows_ptr, max_arrows_nb, arrows_nb, space_X, space_Y, space_Z, 1, 0);
+    if (randomize) print_user_choices(arrows_ptr, max_arrows_nb, arrows_nb, space_X, space_Y, space_Z, 1, 0);
 
     /*--------------------------------------------------------------------------------*/