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The red cable has good spectral transmission redward of 4000 Å out to nearly 2 m (see Figure 7).
The aperture size of 2 arc-seconds was selected for good sky suppression of the OH emission lines that dominate the sky brightness redward of about 6000 Å. In addition, since atmospheric dispersion is not as bad towards the red end of the optical spectrum, the 2 arc-second diameter should not present a significant loss of light due to this effect.