The estimated 1.7300 upper ceiling is subject to actual prices of EURUSD and NZDUSD at their lower ceilings. The estimated lower ceiling for EURUSD at 1.0800/1.0500 and ECB may undertake sterilization, and/or JPY and CHF carry traders may carry EUR at EURUSD lower ceiling or at USDCHF lower ceiling and or at USDJPY lower ceiling.