Sensitivity of Class ST to Prepayments Assumed Price 114.18996%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 10.4% 9.4% 9.2% 7.7% 5.2375% .................................... 5.4% 4.4% 4.2% 2.8% 6.2375% .................................... 0.5% (0.5)% (0.7)% (2.1)% 6.5500% and above ................    (1.1)% (2.0)% (2.2)% (3.6)% Sensitivity of Class SU to Prepayments Assumed Price 115.83159%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 10.7% 9.5% 9.3% 7.7% 5.2375% .................................... 5.5% 4.4% 4.2% 2.6% 6.2375% .................................... 0.4% (0.6)% (0.8)% (2.4)% 6.5500% and above ................    (1.2)% (2.2)% (2.4)% (3.9)% Sensitivity of Class SV to Prepayments Assumed Price 117.47323%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 11.0% 9.7% 9.5% 7.7% 5.2375% .................................... 5.6% 4.4% 4.2% 2.5% 6.2375% .................................... 0.3% (0.8)% (1.0)% (2.7)% 6.5500% and above ................    (1.3)% (2.4)% (2.6)% (4.3)% Sensitivity of Class SW to Prepayments Assumed Price 163.43896%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 16.3% 13.0% 12.4% 7.7% 5.2375% .................................... 7.7% 4.4% 3.8% (0.9)% 6.2375% ....................................    (1.0)% (4.1)% (4.6)% (9.4)% 6.5500% and above ................    (3.8)% (6.7)% (7.3)% (12.0)% Sensitivity of Class SX to Prepayments Assumed Price 107.62343%* PSA Prepayment Assumption Rates LIBOR 100% 270% 300% 550% 4.2375% .................................... 9.3% 8.7% 8.6% 7.8% 5.2375% .................................... 5.0% 4.4% 4.3% 3.5% 6.2375% .................................... 0.7% 0.2% 0.1% (0.7)% 6.5500% and above ................    (0.6)% (1.1)% (1.2)% (2.0)% *    The price does not include accrued interest. Accrued interest has been added to the price in calculating the yields set forth in the table. S-42