The dollar index (DXY00) on Tuesday spent most of the day on the downside, then recovered a bit in the afternoon, ending little changed.  The dollar came under downward pressure from Tuesday's nearly -12% plunge in oil prices, which was dovish for Fed policy. However, the dollar had underlying support from the +5.6 bp rise in the 10-year T-note yield. Tuesday's existing home sales report was supportive of the dollar.  US Feb existing home sales rose by +1.7% m/m to 4.09 million, stronger than expectation ...