diff --git a/src/graphics/arrows.c b/src/graphics/arrows.c
index 4922845..14ee33a 100644
--- a/src/graphics/arrows.c
+++ b/src/graphics/arrows.c
@@ -164,6 +164,15 @@ void arrows_write_basis(long offset)
     graphics_write_line (offset + 4, offset + 5);
 }
 
+
+static void show_one_arrow_data(int offset_vertex, int offset_colors,
+                float vx, float vy, float vz, float base, float tip)
+{
+    printf("offset_vertex = %d   vx = %8.5f   vy = %8.5f   vz = %8.5f   base = %8.5f   tip = %8.5f\n",\
+           offset_vertex, vx, vy, vz, base, tip);
+}
+
+
 /******************************************************************************/
 
 void write_one_arrow(int offset_vertex, int offset_colors, int offset_lines,
@@ -185,6 +194,9 @@ void write_one_arrow(int offset_vertex, int offset_colors, int offset_lines,
           vy = (2 * y / space_Y - 1) * space_Y / max + (1 / max),
           vz = (2 * z / space_Z - 1) * space_Z / max + (1 / max);
 
+    show_one_arrow_data(offset_vertex, offset_colors,
+                        vx, vy, vz, arrow_basis_width, arrow_tip_padding);
+
     //  X - X  axis - central star (basis)
     graphics_write_vertex(vx + arrow_basis_width, vy, vz);
     graphics_write_vertex(vx - arrow_basis_width, vy, vz);
diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index 5f2d1ee..60bfef1 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -882,7 +882,7 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
     int density_max = space_X * space_Y * space_Z;
     int max = fmax(space_X, space_Y); max = fmax(max, space_Z);
 
-    int specif_arrows_nb = 7;//rand() % density_max;
+    int specif_arrows_nb = 1;//rand() % density_max;
     int arrows_nb = 0;
     int pref_show_grids = 1;    //  0,   1,   2, 3, 5,   6, 10, 15,   30,   etc
                                 // xyz,  0,   x, y, z,  xy, xz, yz,  xyz
@@ -911,8 +911,8 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
 
     offset_vertex += (space_X + space_Y + space_Z - 3) * 4;
     offset_colors += (space_X + space_Y + space_Z - 3) * 4;
-    if (style)  offset_lines += 2 * (space_X + space_Y + space_Z - 3);
-    else        offset_lines += 4 * (space_X + space_Y + space_Z - 3);
+    /* if (style)  offset_lines += 2 * (space_X + space_Y + space_Z - 3); */
+    /* else        offset_lines += 4 * (space_X + space_Y + space_Z - 3); */
 
     for (int i = 0; i < arrows_nb; i++) {
         weight = arrows[i].load;