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\subsection{Discussion of the Proposed Failure Modes}  {\em 'No-beam':} events are defined to start when the beam current drops below a given limit.  For several facilities this is currently not the case.   Table~\ref{table:pf_limits} Table~\ref{tab:pf_limits}  shows, that ALBA, BESSY2 and LNLS-UVX do consider a closure of the photon shutters by an interlock equivalent to a loss of the electron beam. Other facilities, like the SLS do not have these kind of interlocks.  We propose that these events should be distinguished: a 'no-beam' event would be only defined by the beam current, and an additional 'photon-shutter-closed' event, that is only recorded if the photon shutters are forced close while there is not a 'no-beam' event.  A similar problem applies to the end of a 'no-beam' event.