deletions | additions       diff --git a/sectionINTRODUCTION_.tex b/sectionINTRODUCTION_.tex  index a267b96..2909b57 100644  --- a/sectionINTRODUCTION_.tex  +++ b/sectionINTRODUCTION_.tex 
...
Since some of these failure modes are specific to individual facilities,   this further complicates the comparison of beam availabilities.  Our aim is to propose a  simple, well-defined, formal operation metrics for storage ring light sources, to make the reliability of these facilities comparable.   The metrics serve serves  to clarify for each facility the beam parameter promised to the users, and the statistical data reveal, how well the standards are met.  The authors are convinced that the application of this metrics will refine our ability  to learn from the reliability comparison of light sources.