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I've been playing with slippage for a short while now, and after bothering all the folks in the Portfolio Trader group I found the PT field of slippage modifier to be most effective.  Essentially it applies slippage on a sliding scale where more slippage is applied as price goes down.  Makes sense when you think that on % terms a 5 cent spread is more for a $10 stock than a $50 stock.
 
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