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\section{Outline of the existing scheme}  The existing design of the AAS is shown schematically in Fig.~\ref{fig:classic}. A beam of light is injected from the alignment table  in the BCA by the (the BCA beam injection system is known  Magical Optical Box (MOB), or MOB),  with one beam going "upstream" towards the telescopes and one going "downstream" towards the beam combiners (Fringe Tracker FT and Science Instrument SI). The injected beam (known as the "primary fiducial") can consist of either laser light at a visible wavelength or broadband light which has components at visible and infrared wavelengths. The design of the MOB ensures that the upstream and downstream beams are anti-parallel to one another.