diff --git a/main.go b/main.go
index 526b454..849966d 100644
--- a/main.go
+++ b/main.go
@@ -143,7 +143,7 @@ func main() {
 	actorColor := color.RGBA { R: 10, G: 58, B: 59, A: 25 }
 	fmt.Printf("actor color = %v\n", actorColor)
 
-	contourLayer := NewContourLayer(rng, field, actorColor, -math.Pi, math.Pi)
+	contourLayer := NewContourLayer(rng, field, actorColor, -math.Pi/3.0, 5.0 * math.Pi)
 	sketch.AddLayer("contours", contourLayer)
 	//sketch.AddLayer("sierpinski-arrowhead", sierpinskiLayer)
 	//	aurora := NewImageLayer("/home/d/Dropbox/photos/Events/2025/Aurora/Photo Nov 11 2025, 9 52 03 PM.jpg")