Update advanced_usage.md

3 years ago · c211c654c8
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 #### variables `evtFault` and `evtFaultSpec`
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+In `eventList`, when the 4th column (event type) equals 6 (apply or clear faults, respectively), the index of the fault events in `evtFault` corresponds to the 5th column of `eventList`. In the current version, we only consider three-phase grounding faults. 
 ##### variable `evtFault`
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