the real issue, page-18

Quote from ASX:

ASX TradeMatch® Advanced Order Types
Centre Point Order®

A Centre Point Order® enables execution at the prevailing midpoint of the best bid and offer of the ASX Central Limit Order Book (CLOB). These anonymous orders transact independently of the CLOB and will only transact with another Centre Point Order®. Once a Centre Point order trades, the trade will be displayed in the trade history window with condition code CX.
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Just another way for the Banksters to rip off the retail investor.