In this figure, we see three graphs side-by-side, labeled (a), (b), and (c). Example (a) is on the left, (b) is in the middle, and (c) is on the right. In each one, the x-axis is labeled "(lambda)'in" and the y-axis is labeled ""(lambda)out." The x- and y-axis both extend to points labeled "R/2."

In example (a), a blue line originates from the intersection of the x- and y-axes and extends diagonally upwards to the right at a 45-degree angle, until it reaches R/2 on the x- and y-axes. In example (b), the blue line extends at a 45-degree angle until it reaches R/2 on the x-axis and a R/3 on the y-axis. And in example (c), the blue line extends at a 45-degree angle until it reaches R/2 on the x-axes and R/4 on the y-axis.