Figure 2 shows that as one moves further from the PMT along the fiber bundle, less light is produced. The results are summarized in Section 6 and behave as expected: the attenuation is exponential as a function of distance from the PMT read out. Figure 4 shows the plots of the geometric means and left/right ratios for the three fiber bundles that were tested. The detailed procedure of extracting the attenuation length was explained above in Section 2.3.