ABUJA — The Debt Management Office is offering N1 trillion in federal government bonds at its September auction, made up of N600 billion of a new 10-year bond maturing in 2036 and N400 billion of the 15.45 per cent June 2038 bond. At the previous auction, N631.02 billion was allotted at 17.79 per cent. Analysts expect strong demand because of excess liquidity in the banking system.