Failing to maintain its initial upward momentum, the rupee today slid by 13 paise to 55.03 against the dollar in late morning trade due to bouts of demand for the US currency from banks and oil importers amid firm cues overseas.The rupee had gained 17 paise in early morning trade and was trading at 54.90. In New York, the US dollar was trading higher, paring some of its Friday losses as investors considered the outlook over Federal Reserve policy.