read the hard printed words explaining the column;
"Pursuant to a Securities and Exchange Commission request, FINRA has agreed to make reported short sale trade data publicly available. Daily Short Sale Volume File formatting guide"
"In the event there is no short data for a particular day, a file will still be produced for that day that will only contain a header and a trailer with a count of “0”."
That's very nice. Now I know the same short pattern when this shot from 0.0002 to 0.0009.