In many cases T-Trades are makeup trades to balance out the daily session that were put on a back burner and not excuted because the session experienced at times heavy volume and rather than during heavy trading and in this case, we had strong volume on .0005's and .0006's.
Rather than drop the price in the middle of the session and paint the chart or alarm the normal flow, they made it up in the after the close, known as T-trade.
T-trades does not necessarily mean dilution, but can and has been known, but because this was really not that large, my guess is a make-up trade.
Have a good day
varok
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