deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 9375e83..73a9514 100644  --- a/untitled.tex  +++ b/untitled.tex 
...
\section{Introduction}  The Automated Alignment System (AAS) and Back End Active Stabilization of Shear and Tilt (BEASST) together have been proposed to align the beam trains in the MROI and to keep these aligned during the night. The A Preliminary Design for the  AAS has been through a Preliminary Design Review (CDR) developed  and some of the  subsystems of the AAS  have been prototyped. prototyped, but BEASST is in a much less well-developed state.  We propose here a modification to the AAS concept which will allow the existing goals to be met while addressing drifts in alignment during the night more rapidly and robustly. At the same time, some of the constraints on the BEASST system can be relaxed, allowing a higher-performance system to be built more quickly. In the following we recall the original goals and concept and outline the proposed modification. The advantages and disadvantages of this modification are then discussed and a way forwards proposed.