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Up: THE BENCH SPECTROGRAPH
Two fibers, located at either end of the ``slit" assembly, connect to comparison sources located near the Bench Spectrograph. This permits comparison light exposures to be made over the course of a target field integration. Such ability to monitor the wavelength zero point may be useful for programs seeking to measure high-precision radial velocities. The comparison source choices are Th-Ar or Cu-Ar with the added availability of a quartz lamp for the aperture/flat field definition of those two fibers. Neutral Density filters are used to adjust the illumination of the Simultaneous Comparison Sources (SCS).