Ann: Corrected Goulamina Drilling Update.pdf, page-61

Official explanation of CXXT
CX is a trade that has occurred in ASX CentrePoint at the current midpoint price. The midpoint price is determined by ASX to be the midpoint between the current ASX bid/offer spread. CXXT is a cross trade or crossing that has occurred in ASX CentrePoint at the current midpoint price


Unofficial explanation:

It's our game, we set the rules, and the big boys can cross trade to pretend genuine sales went through to manipulate the SP as much as they want.