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The file extension “ras” is used for spiking data files created by the SpikeMonitor. The format is a space separated list containing “time neuronnumber” pairs:
5.680800 2120 5.683600 496 5.685500 1936 5.693700 2464 5.700700 1856 5.716600 1464
When running in parallel you will often encounter having to merge the ras files from multiple ranks (e.g. output.X.ras). This can be done efficiently using linux
sort -g -m output.*.ras > output.ras