SHORT-DATED SAUDI RIYAL RATES FIRM IN QUIET MARKET Short-dated Saudi riyal interest rates firmed but other rates were steady in quiet trading, dealers said. "Day-to-day money is a bit tighter," one trader said. Overnight rose two points to six pct, while most quotes for tomorrow/next and spot/next were 1/2 point higher at around six, 5-1/2 pct. The periods were essentially steady at 5-7/8, 5/8 pct for one month, 6-1/2, 3/8 pct for three, and 6-7/8, 11/16 for six months. The spot riyal stood at 3.7500/05 to the dollar after 3.7506/09 yesterday.