PS - Preliminary Support (buys provide a bounce to slow move down)
SC - Selling Climax (Buys absorb remaining sells , end of panic sell off)
AR - Automatic Rally (Price rise caused by volume buys and lack of sells on the orderbook)
ST - Secondary Test (retest of support, may occur multiple times)
Shake Out - Volume sell to drop price encouraging inexperienced...
Just a example to show how gaps in the Volume Profile caused during fast falls or rises in price are filled at a later date.
The gap between 4200 down to 3800 during the drop on 24th November was filled just over 24 hours later.
The left window shows the volume profile prior to the drop and up to the bottom of the drop.
The right window shows the volume profile...