2400px wide image (coded 1200px wide) = 2x
2400px wide image (coded 1200px wide) = 2x
600px wide image (coded 300px wide) = 2x
600px wide image (coded 600px wide) = 1x
600px wide image (coded 1200px wide) = 0.5x
600px wide image (coded 100% wide) = Fluid Resolution