What causes these fliers?

[dinzy]

Is this a graphing glitch perhaps from a rounding error or is there actually an errant trade that happens at that pricepoint?  The order book is not light enough to allow a legitimate trade at those prices.  

Does anyone have an idea?

[mikeintimesaves9]

This was the explanation from last night http://forum.bitcoin.org/index.php?topic=22750.msg290623#msg290623

[dinzy]

Thanks.  SO its a bug.  Anyone know how to exploit it

[kokojie]

My guess is that because mtgox system doesn't really sell you every BTC at the exact price you have entered. For example, when you trying to buy 10 BTC for $17, it can execute like this:
5 BTC @ $15
5 BTC @ $19

So they still average out to 10 BTC @ $17, but the trade history display them as $15 and $19 trades

[dinzy]

That wouldn't make sense.  The market is pretty deep on both sides and requires a large amount of transactions to move prices.  Now is a bad example but it would take 3000 trades to go over 17 and ~ 1500 to dip below 16.  It's a bug so for some reason they must be matching the remainders in a strange way leading to these crazy numbers.