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\subsection{Primary Failure Modes in Practice}  Table~\ref{tab:pf-limits} shows the current limits for the primary  failure modes, as they are used today,  partly depending on the operation modes at the seven facilities. The column $I_{\hbox{nom}}$ shows the maximum current in the given operation mode.  The current $I_{\hbox{inj}}$ is the typical value when injection would start in this operation mode,  below $I_{\hbox{tol}}$ it would be considered a ``low-beam-current'' failure.