Similar to Figure 8, but without the ﹩{u}^{{\prime} }﹩ filter. After the removal of ﹩{u}^{{\prime} }﹩, the Johnson–Cousins U filter becomes increasingly important, as seen by its rising importance values toward the final steps. This behavior is consistent with the similarity between the U and ﹩{u}^{{\prime} }﹩ transmission profiles, and it indicates that the model selects U as the next best substitute for capturing information in the 0.3–0.4 μm range.