Diagram 2
Layer 1
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - blue
zone external - purple
zone external - purple
zone external - purple