Assumed Characteristics of the Mortgage Loans Underlying the Group 1, 3, 4, 5 and 8
Trust Assets1:
Principal
Balance2
Weighted Average
Remaining Term to
Maturity
(in months)
Weighted Average
Loan Age
(in months)
Weighted
Average
Mortgage Rate3
Group 1 Trust Assets
$200,000,000
357
2
6.88%
Group 3 Trust Assets
$200,000,000
357
2
6.88%
Group 4 Trust Assets
$ 50,000,000
358
1
6.91%
Group 5 Trust Assets
$ 50,000,000
357
3
6.867%
Group 8 Trust Assets
$119,417,560
352
7
6.06%
1As of October 1, 2007.
2Does not include the Group 5 Trust Assets that will be added to pay the
Trustee Fee.
3The Mortgage Loans underlying the Group 1, 3, 4, 5 and 8 Trust Assets may
bear interest at rates ranging from 0.25% to 1.50% per annum above the
related Certificate Rate.
The actual remaining terms to maturity, loan ages and Mortgage Rates of many of the Mortgage
Loans underlying the Group 1, 3, 4, 5 and 8 Trust Assets will differ from the weighted averages
shown above, perhaps significantly. See "The Trust Assets – The Mortgage Loans" in this
Supplement. See Exhibit A to this Supplement for certain information regarding the characteris-
tics of the Mortgage Loans included in the related Underlying Trusts.
Issuance of Securities: The Securities, other than the Residual Securities, will initially be
issued in book-entry form through the book-entry system of the U.S. Federal Reserve Banks (the
"Fedwire Book-Entry System"). The Residual Securities will be issued in fully registered,
certificated form. See "Description of the Securities – Form of Securities" in this Supplement.
Modification and Exchange: If you own exchangeable Securities you will be able, upon
notice and payment of an exchange fee, to exchange them for a proportionate interest in the
related Securities shown on Schedule I to this Supplement. See "Description of the Securi-
ties – Modification and Exchange" in this Supplement.
Increased Minimum Denomination Classes:
Each Class that constitutes a Special, Principal
Only, Interest Only or Interest Only Inverse Floating Rate Class. See "Description of the
Securities – Form of Securities" in this Supplement.
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