Talking SXY intraday not an elongated time series. STO TO bid was 2day not b4. What happened b4 is interesting but ancient history like in 1987, I am afraid on a wee teeny blopper like SXY. STO was around in 1987. It will not be around much longer.
Only cricket commentators go back as far 2017 and before like in ur chart, they are going back to Greg Dyer's 1987 dropped ball cum catch.