Convergence of Fixed-point Iteration. The convergence of the iterative process illustrated in Figure 4 depends on the slope of the curve relating E - out to A - In. The process will converge provided the slope is not too great (Bauer's fixed-point theorem). We illustrate the ten data sets from this laboratory: the slope is less than that of the line of identity, and fixed-point convergence is guaranteed. Numbers 1 to 10 correspond to the data sets Flind1 - Flind10 respectively.