diff --git a/src/Arts.cs b/src/Arts.cs
index e275033..33859b5 100644
--- a/src/Arts.cs
+++ b/src/Arts.cs
@@ -134,7 +134,7 @@ static class Arts
                 Vec3 b = Vec3.Lerp(p[1], p[2], t);
                 Vec3 c = Vec3.Lerp(p[2], p[3], t);
                 Vec3 pos = Vec3.Lerp(Vec3.Lerp(a, b, t), Vec3.Lerp(b, c, t), t);
-                float thc = (1.0f + Maths.precision(t, 0.2f) * 2.0f) * U.mm;
+                float thc = (1.0f + Maths.precision(t, 0.333f) * 2.0f) * U.mm;
                 Lines.Add(
                     pastPos,
                     pos,