Thanks jonzobot.
It may be a little different this time. During a four-day period during that Feb spike volume amounted to a total of approx 1.5 million.
Today's trading so far, 2.5 hours or so, exceeds that 4-day total. As I write this morning's volume is already at 1.6 million.
3-month cart shows daily volume during the last spike. https://www.quotemedia.com/portal/chart?qm_symbol=rvx%3Acc