CAIRO, Jan 21 (Reuters) - Average yields on Egypt's three-
and nine-month treasury bills dipped slightly at an auction
on Sunday, central bank data showed.
Yields on the 91-day bills dipped to 18.362 percent from 18.394 at the last sale, while yields on the 273-day bills also eased, to 17.563 percent from 17.659 percent. (Reporting by Arwa Gaballa, Editing by William Maclean)