deletions | additions       diff --git a/sectionCURRENT_STATU.tex b/sectionCURRENT_STATU.tex  index 05b9165..df0cc4c 100644  --- a/sectionCURRENT_STATU.tex  +++ b/sectionCURRENT_STATU.tex 
...
But the minimal required duration varied between 15 and 60 minutes between facilities.   In the case of long beam outages most facilities organised compensation time for the users, to allow them to finish their experiments.   The compensation time was accounted for in different ways, depending on the facility: some fully subtracted the extra beam time from the downtime, others ignored this extra time for the availability calculation.   All light sources did record other events than beam outages, like increased beam sizes or orbit problems, but non no one  did publish statistics of these other failure modes in regular intervals. During a discussion round at the ARW 2013 in Melbourne~\cite{Arw:2013Url} we polled the calculation of beam availability from participants of ten different light sources\footnote{Participants of the ARW'13 presenting their calculation of beam availability came from: ALBA, Australian Synchrotron, BESSY II, Diamond, SPEAR, NSRRC, SOLEIL, Elettra, SLS and PETRA III.} with the same result as the survey of 2008.   The authors then concluded that a common operation metrics is needed, that allows a standardized calculation and consequently a meaningful comparison of the reliability of different storage ring light sources.