deletions | additions       diff --git a/sectionPROPOSED_PRIM.tex b/sectionPROPOSED_PRIM.tex  index 0fb1dc1..87a36d8 100644  --- a/sectionPROPOSED_PRIM.tex  +++ b/sectionPROPOSED_PRIM.tex 
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Reliability is the ability of a system to provide a certain function over time.  The function of a light source is to provide synchrotron radiation for user experiments.  From the perspective of a user it does not matter much, what type of failure prevented   him to perform from performing  his experiment. But in order to progress to highest reliability light sources one needs to differentiate   the failure modes;   for each mode solutions should be found to increase the mean-time-between-failure, 
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when the insertion devices move back to their closed positions (SLS).   PETRA III adds an amount of time to allow for the warm-up of the optical components at the beamlines.   These practices are oriented to use a beam availability understood as photon beam availability.   Facilities are counting the time the photon beam is readily ready  to be used at the beamlines. ``Low-beam-current'' failures do vary significantly between facilities.   At Spring-8, for example, a beam decay of about 0.1\% starts a ``low-beam-current'' failure,