Gold is poised to end a volatile week on the front foot after cooler-than-expected U.S. jobs data eased investors' rate-hike expectations. New York gold adds 1.5% to trade at $4,188.10 a troy ounce in early European trade. The dollar and U.S. Treasury yields fell following Thursday's nonfarm payrolls data, in turn increasing the appeal of nonyielding gold. Gold is also supported by central banks returning to the market as buyers in May, ING analysts Warren Patterson and Ewa Manthey write.(josephmichael.stonor@wsj.com)