Mumbai, March 11 -- The Indian rupee recovered some of its lost momentum and settled with a gain of 10 paise at 87.21 (provisional) against the US dollar on Tuesday as the American currency index fell to its four-month low level and crude oil prices also stayed subdued. The US dollar index slumped today, adding to recent losses and testing fresh four month low. Modest gains were seen in last session but the US currency has failed to sustain them and fell further under 104 mark. It currently trades down 0.58% at 103.34. A volatile trend in domestic equity markets and outflow of foreign capital amid fear of recession in the US and trade-related uncertainties restricted the recovery in the local currency. The benchmark 30-share BSE Sensex hi...