diff --git a/src/graphics/buffers.c b/src/graphics/buffers.c
index 2721ec4..8f691c9 100644
--- a/src/graphics/buffers.c
+++ b/src/graphics/buffers.c
@@ -624,7 +624,7 @@ static bool arrows_anchors (long x, long y, long z,
                             GLfloat *vertex_origin, GLfloat *colors_origin)
 {
 
-    float i, j, k, vx, vy, vz, max = fmax(x, y), ad = 0.5f;
+    float i, j, k, vx, vy, vz, max = fmax(x, y), ad = 0.25f;
                                max = fmax(max, z);
 
     printf("arrows_anchors  max = %5.2f  max / 2 = %5.2f\n", max, max / 2);