χ² values for histograms of convolved simulations as shown in Fig. 5 but for all the limb angles μ = 0.2−1.0. The χ² values for 0 G, 50 G, and 200 G are represented by dotted, dashed, and long-dashed lines, respectively. The Δχ² for a confidence level of 99% is 75 for 50 bins. A Δχ² of 75 is indicated by the solid line on the right of each plot. The grey line at χ² = 49 indicates the level where .