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Two science fiber cables are currently available on Hydra; one for observations in the red, the other for blue observations. Each fiber in the red cable subtends 2 arc-seconds on the sky while each blue fiber subtends 3 arc-seconds.
On the end of each fiber is mounted a small right angle prism with an aluminized hypotenuse. This fiber/prism assembly, in turn, is mounted in a magnetic ``button" which holds the fiber in position on the focal plate. Figure 1 shows a schematic view of this button.
Figure 1: Schematic view of a fiber button on the focal plate.