margin calls

This is interesting... from Man via etrade

Dear CFD Trader,
>
> Please be aware that due to recent market volatility that the following
> margin rates have been increased and are effective immediately:
>
> OXIANA LTD (OXR.ASX) Old Margin 10% NEW MARGIN 15%
> ZINIFEX LTD (ZFX.ASX) Old Margin 10% NEW MARGIN 15%
> LIHIR GOLD (LHG.ASX) Old Margin 10% NEW MARGIN 15%
> PALADIN (PDN.ASX) Old Margin 10% NEW MARGIN 20%
> BENDIGO MINING (BDG.ASX) Old Margin 10% NEW MARGIN 20%
>
> Note that if you currently hold a position in any of the above stocks that
> your initial margin requirements will be affected and your account could
> possibly be on margin call. All margin calls are to be settled the same day
> by either reducing open positions, cancelling outstanding orders or
> depositing funds with proof of deposit required before 4pm AEST to the CFD
> desk.
>