Trading platform discrepancies: XAGUSD 03 Sept 2010 daily close

Last quote of 03 Sept 2010 on the Saxo platform: 19.6175 USD/ounce.

Last quote of 03 Sept 2010 on the MT4 platform: 19.70 USD/ounce.

Last quote of 03 Sept 2010 on the Oanda platform: 19.83 USD/ounce (this screenshot was made a bit later, when trading has already started in the Asian markets).