The .last_spq0 contains information which Q was the last one sieved. This information is also contained in the output file (and normally this is not lowt when there is a power outage). When starting the siever with the -R flag, the siever will parse the last special Q from the last complete line in the outputfile and then continues sieving from where it was interrupted. So the .last_spq0 file is not needed for continuing an interrupted range.
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