orange [upgraded thickened]] blue [upgraded and thickened]] green [upgraded and thickened]]

10 layers [the more layers, the more cost-effective]] 9 layers [the more layers, the more cost-effective]] 8 layers [the more layers, the more cost-effective]] 7 layers [the more layers, the more cost-effective]] 6 layers [the more layers, the more cost-effective]] 5 layers [the more layers, the more cost-effective]] 4 layers [the more layers, the more cost-effective]] 3 layers [the more layers, the more cost-effective]] 2 layers [the more layers, the more cost-effective]] 1 layer [the more layers, the more cost-effective]]