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Fiber to fiber throughput variations do exist. The top half of Figure 8 shows a typical cross section of a flat field obtained for the red fiber cable.
Figure 8: Cross section plot of spatial profiles. UPDATED FIGURE NOT YET AVAILABLE
A similar cross section is shown in the bottom half of Figure 8 for the blue cable. These fiber-to-fiber differences are most likely due to the quality of the prism attached to the input end of the fiber and inherent stresses in each fiber. Spectrograph vignetting across the spatial dimension is apparent in both figures.